                    GNU GENERAL PUBLIC LICENSE&#xA;                       Version 2, June 1991&#xA;&#xA; Copyright (C) 1989, 1991 Free Software Foundation, Inc.,&#xA; 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA&#xA; Everyone is permitted to copy and distribute verbatim copies&#xA; of this license document, but changing it is not allowed.&#xA;&#xA;                            Preamble&#xA;&#xA;  The licenses for most software are designed to take away your&#xA;freedom to share and change it.  By contrast, the GNU General Public&#xA;License is intended to guarantee your freedom to share and change free&#xA;software--to make sure the software is free for all its users.  This&#xA;General Public License applies to most of the Free Software&#xA;Foundation&#39;s software and to any other program whose authors commit to&#xA;using it.  (Some other Free Software Foundation software is covered by&#xA;the GNU Lesser General Public License instead.)  You can apply it to&#xA;your programs, too.&#xA;&#xA;  When we speak of free software, we are referring to freedom, not&#xA;price.  Our General Public Licenses are designed to make sure that you&#xA;have the freedom to distribute copies of free software (and charge for&#xA;this service if you wish), that you receive source code or can get it&#xA;if you want it, that you can change the software or use pieces of it&#xA;in new free programs; and that you know you can do these things.&#xA;&#xA;  To protect your rights, we need to make restrictions that forbid&#xA;anyone to deny you these rights or to ask you to surrender the rights.&#xA;These restrictions translate to certain responsibilities for you if you&#xA;distribute copies of the software, or if you modify it.&#xA;&#xA;  For example, if you distribute copies of such a program, whether&#xA;gratis or for a fee, you must give the recipients all the rights that&#xA;you have.  You must make sure that they, too, receive or can get the&#xA;source code.  And you must show them these terms so they know their&#xA;rights.&#xA;&#xA;  We protect your rights with two steps: (1) copyright the software, and&#xA;(2) offer you this license which gives you legal permission to copy,&#xA;distribute and/or modify the software.&#xA;&#xA;  Also, for each author&#39;s protection and ours, we want to make certain&#xA;that everyone understands that there is no warranty for this free&#xA;software.  If the software is modified by someone else and passed on, we&#xA;want its recipients to know that what they have is not the original, so&#xA;that any problems introduced by others will not reflect on the original&#xA;authors&#39; reputations.&#xA;&#xA;  Finally, any free program is threatened constantly by software&#xA;patents.  We wish to avoid the danger that redistributors of a free&#xA;program will individually obtain patent licenses, in effect making the&#xA;program proprietary.  To prevent this, we have made it clear that any&#xA;patent must be licensed for everyone&#39;s free use or not licensed at all.&#xA;&#xA;  The precise terms and conditions for copying, distribution and&#xA;modification follow.&#xA;&#xA;&#x9;&#x9;            GNU GENERAL PUBLIC LICENSE&#xA;   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION&#xA;&#xA;  0. This License applies to any program or other work which contains&#xA;a notice placed by the copyright holder saying it may be distributed&#xA;under the terms of this General Public License.  The &#34;Program&#34;, below,&#xA;refers to any such program or work, and a &#34;work based on the Program&#34;&#xA;means either the Program or any derivative work under copyright law:&#xA;that is to say, a work containing the Program or a portion of it,&#xA;either verbatim or with modifications and/or translated into another&#xA;language.  (Hereinafter, translation is included without limitation in&#xA;the term &#34;modification&#34;.)  Each licensee is addressed as &#34;you&#34;.&#xA;&#xA;Activities other than copying, distribution and modification are not&#xA;covered by this License; they are outside its scope.  The act of&#xA;running the Program is not restricted, and the output from the Program&#xA;is covered only if its contents constitute a work based on the&#xA;Program (independent of having been made by running the Program).&#xA;Whether that is true depends on what the Program does.&#xA;&#xA;  1. You may copy and distribute verbatim copies of the Program&#39;s&#xA;source code as you receive it, in any medium, provided that you&#xA;conspicuously and appropriately publish on each copy an appropriate&#xA;copyright notice and disclaimer of warranty; keep intact all the&#xA;notices that refer to this License and to the absence of any warranty;&#xA;and give any other recipients of the Program a copy of this License&#xA;along with the Program.&#xA;&#xA;You may charge a fee for the physical act of transferring a copy, and&#xA;you may at your option offer warranty protection in exchange for a fee.&#xA;&#xA;  2. You may modify your copy or copies of the Program or any portion&#xA;of it, thus forming a work based on the Program, and copy and&#xA;distribute such modifications or work under the terms of Section 1&#xA;above, provided that you also meet all of these conditions:&#xA;&#xA;    a) You must cause the modified files to carry prominent notices&#xA;    stating that you changed the files and the date of any change.&#xA;&#xA;    b) You must cause any work that you distribute or publish, that in&#xA;    whole or in part contains or is derived from the Program or any&#xA;    part thereof, to be licensed as a whole at no charge to all third&#xA;    parties under the terms of this License.&#xA;&#xA;    c) If the modified program normally reads commands interactively&#xA;    when run, you must cause it, when started running for such&#xA;    interactive use in the most ordinary way, to print or display an&#xA;    announcement including an appropriate copyright notice and a&#xA;    notice that there is no warranty (or else, saying that you provide&#xA;    a warranty) and that users may redistribute the program under&#xA;    these conditions, and telling the user how to view a copy of this&#xA;    License.  (Exception: if the Program itself is interactive but&#xA;    does not normally print such an announcement, your work based on&#xA;    the Program is not required to print an announcement.)&#xA;&#xA;These requirements apply to the modified work as a whole.  If&#xA;identifiable sections of that work are not derived from the Program,&#xA;and can be reasonably considered independent and separate works in&#xA;themselves, then this License, and its terms, do not apply to those&#xA;sections when you distribute them as separate works.  But when you&#xA;distribute the same sections as part of a whole which is a work based&#xA;on the Program, the distribution of the whole must be on the terms of&#xA;this License, whose permissions for other licensees extend to the&#xA;entire whole, and thus to each and every part regardless of who wrote it.&#xA;&#xA;Thus, it is not the intent of this section to claim rights or contest&#xA;your rights to work written entirely by you; rather, the intent is to&#xA;exercise the right to control the distribution of derivative or&#xA;collective works based on the Program.&#xA;&#xA;In addition, mere aggregation of another work not based on the Program&#xA;with the Program (or with a work based on the Program) on a volume of&#xA;a storage or distribution medium does not bring the other work under&#xA;the scope of this License.&#xA;&#xA;  3. You may copy and distribute the Program (or a work based on it,&#xA;under Section 2) in object code or executable form under the terms of&#xA;Sections 1 and 2 above provided that you also do one of the following:&#xA;&#xA;    a) Accompany it with the complete corresponding machine-readable&#xA;    source code, which must be distributed under the terms of Sections&#xA;    1 and 2 above on a medium customarily used for software interchange; or,&#xA;&#xA;    b) Accompany it with a written offer, valid for at least three&#xA;    years, to give any third party, for a charge no more than your&#xA;    cost of physically performing source distribution, a complete&#xA;    machine-readable copy of the corresponding source code, to be&#xA;    distributed under the terms of Sections 1 and 2 above on a medium&#xA;    customarily used for software interchange; or,&#xA;&#xA;    c) Accompany it with the information you received as to the offer&#xA;    to distribute corresponding source code.  (This alternative is&#xA;    allowed only for noncommercial distribution and only if you&#xA;    received the program in object code or executable form with such&#xA;    an offer, in accord with Subsection b above.)&#xA;&#xA;The source code for a work means the preferred form of the work for&#xA;making modifications to it.  For an executable work, complete source&#xA;code means all the source code for all modules it contains, plus any&#xA;associated interface definition files, plus the scripts used to&#xA;control compilation and installation of the executable.  However, as a&#xA;special exception, the source code distributed need not include&#xA;anything that is normally distributed (in either source or binary&#xA;form) with the major components (compiler, kernel, and so on) of the&#xA;operating system on which the executable runs, unless that component&#xA;itself accompanies the executable.&#xA;&#xA;If distribution of executable or object code is made by offering&#xA;access to copy from a designated place, then offering equivalent&#xA;access to copy the source code from the same place counts as&#xA;distribution of the source code, even though third parties are not&#xA;compelled to copy the source along with the object code.&#xA;&#xA;  4. You may not copy, modify, sublicense, or distribute the Program&#xA;except as expressly provided under this License.  Any attempt&#xA;otherwise to copy, modify, sublicense or distribute the Program is&#xA;void, and will automatically terminate your rights under this License.&#xA;However, parties who have received copies, or rights, from you under&#xA;this License will not have their licenses terminated so long as such&#xA;parties remain in full compliance.&#xA;&#xA;  5. You are not required to accept this License, since you have not&#xA;signed it.  However, nothing else grants you permission to modify or&#xA;distribute the Program or its derivative works.  These actions are&#xA;prohibited by law if you do not accept this License.  Therefore, by&#xA;modifying or distributing the Program (or any work based on the&#xA;Program), you indicate your acceptance of this License to do so, and&#xA;all its terms and conditions for copying, distributing or modifying&#xA;the Program or works based on it.&#xA;&#xA;  6. Each time you redistribute the Program (or any work based on the&#xA;Program), the recipient automatically receives a license from the&#xA;original licensor to copy, distribute or modify the Program subject to&#xA;these terms and conditions.  You may not impose any further&#xA;restrictions on the recipients&#39; exercise of the rights granted herein.&#xA;You are not responsible for enforcing compliance by third parties to&#xA;this License.&#xA;&#xA;  7. If, as a consequence of a court judgment or allegation of patent&#xA;infringement or for any other reason (not limited to patent issues),&#xA;conditions are imposed on you (whether by court order, agreement or&#xA;otherwise) that contradict the conditions of this License, they do not&#xA;excuse you from the conditions of this License.  If you cannot&#xA;distribute so as to satisfy simultaneously your obligations under this&#xA;License and any other pertinent obligations, then as a consequence you&#xA;may not distribute the Program at all.  For example, if a patent&#xA;license would not permit royalty-free redistribution of the Program by&#xA;all those who receive copies directly or indirectly through you, then&#xA;the only way you could satisfy both it and this License would be to&#xA;refrain entirely from distribution of the Program.&#xA;&#xA;If any portion of this section is held invalid or unenforceable under&#xA;any particular circumstance, the balance of the section is intended to&#xA;apply and the section as a whole is intended to apply in other&#xA;circumstances.&#xA;&#xA;It is not the purpose of this section to induce you to infringe any&#xA;patents or other property right claims or to contest validity of any&#xA;such claims; this section has the sole purpose of protecting the&#xA;integrity of the free software distribution system, which is&#xA;implemented by public license practices.  Many people have made&#xA;generous contributions to the wide range of software distributed&#xA;through that system in reliance on consistent application of that&#xA;system; it is up to the author/donor to decide if he or she is willing&#xA;to distribute software through any other system and a licensee cannot&#xA;impose that choice.&#xA;&#xA;This section is intended to make thoroughly clear what is believed to&#xA;be a consequence of the rest of this License.&#xA;&#xA;  8. If the distribution and/or use of the Program is restricted in&#xA;certain countries either by patents or by copyrighted interfaces, the&#xA;original copyright holder who places the Program under this License&#xA;may add an explicit geographical distribution limitation excluding&#xA;those countries, so that distribution is permitted only in or among&#xA;countries not thus excluded.  In such case, this License incorporates&#xA;the limitation as if written in the body of this License.&#xA;&#xA;  9. The Free Software Foundation may publish revised and/or new versions&#xA;of the General Public License from time to time.  Such new versions will&#xA;be similar in spirit to the present version, but may differ in detail to&#xA;address new problems or concerns.&#xA;&#xA;Each version is given a distinguishing version number.  If the Program&#xA;specifies a version number of this License which applies to it and &#34;any&#xA;later version&#34;, you have the option of following the terms and conditions&#xA;either of that version or of any later version published by the Free&#xA;Software Foundation.  If the Program does not specify a version number of&#xA;this License, you may choose any version ever published by the Free Software&#xA;Foundation.&#xA;&#xA;  10. If you wish to incorporate parts of the Program into other free&#xA;programs whose distribution conditions are different, write to the author&#xA;to ask for permission.  For software which is copyrighted by the Free&#xA;Software Foundation, write to the Free Software Foundation; we sometimes&#xA;make exceptions for this.  Our decision will be guided by the two goals&#xA;of preserving the free status of all derivatives of our free software and&#xA;of promoting the sharing and reuse of software generally.&#xA;&#xA;                            NO WARRANTY&#xA;&#xA;  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY&#xA;FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.  EXCEPT WHEN&#xA;OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES&#xA;PROVIDE THE PROGRAM &#34;AS IS&#34; WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED&#xA;OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF&#xA;MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  THE ENTIRE RISK AS&#xA;TO THE QUALITY AND PERFORMANCE OF THE PROGRAM IS WITH YOU.  SHOULD THE&#xA;PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING,&#xA;REPAIR OR CORRECTION.&#xA;&#xA;  12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING&#xA;WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR&#xA;REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,&#xA;INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING&#xA;OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED&#xA;TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY&#xA;YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER&#xA;PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE&#xA;POSSIBILITY OF SUCH DAMAGES.&#xA;&#xA;&#x9;&#x9;            END OF TERMS AND CONDITIONS&#xA;&#xA;&#x9;        How to Apply These Terms to Your New Programs&#xA;&#xA;  If you develop a new program, and you want it to be of the greatest&#xA;possible use to the public, the best way to achieve this is to make it&#xA;free software which everyone can redistribute and change under these terms.&#xA;&#xA;  To do so, attach the following notices to the program.  It is safest&#xA;to attach them to the start of each source file to most effectively&#xA;convey the exclusion of warranty; and each file should have at least&#xA;the &#34;copyright&#34; line and a pointer to where the full notice is found.&#xA;&#xA;    &lt;one line to give the program&#39;s name and a brief idea of what it does.&gt;&#xA;    Copyright (C) &lt;year&gt;  &lt;name of author&gt;&#xA;&#xA;    This program is free software; you can redistribute it and/or modify&#xA;    it under the terms of the GNU General Public License as published by&#xA;    the Free Software Foundation; either version 2 of the License, or&#xA;    (at your option) any later version.&#xA;&#xA;    This program is distributed in the hope that it will be useful,&#xA;    but WITHOUT ANY WARRANTY; without even the implied warranty of&#xA;    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the&#xA;    GNU General Public License for more details.&#xA;&#xA;    You should have received a copy of the GNU General Public License along&#xA;    with this program; if not, write to the Free Software Foundation, Inc.,&#xA;    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.&#xA;&#xA;Also add information on how to contact you by electronic and paper mail.&#xA;&#xA;If the program is interactive, make it output a short notice like this&#xA;when it starts in an interactive mode:&#xA;&#xA;    Gnomovision version 69, Copyright (C) year name of author&#xA;    Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w&#39;.&#xA;    This is free software, and you are welcome to redistribute it&#xA;    under certain conditions; type `show c&#39; for details.&#xA;&#xA;The hypothetical commands `show w&#39; and `show c&#39; should show the appropriate&#xA;parts of the General Public License.  Of course, the commands you use may&#xA;be called something other than `show w&#39; and `show c&#39;; they could even be&#xA;mouse-clicks or menu items--whatever suits your program.&#xA;&#xA;You should also get your employer (if you work as a programmer) or your&#xA;school, if any, to sign a &#34;copyright disclaimer&#34; for the program, if&#xA;necessary.  Here is a sample; alter the names:&#xA;&#xA;  Yoyodyne, Inc., hereby disclaims all copyright interest in the program&#xA;  `Gnomovision&#39; (which makes passes at compilers) written by James Hacker.&#xA;&#xA;  &lt;signature of Ty Coon&gt;, 1 April 1989&#xA;  Ty Coon, President of Vice&#xA;&#xA;This General Public License does not permit incorporating your program into&#xA;proprietary programs.  If your program is a subroutine library, you may&#xA;consider it more useful to permit linking proprietary applications with the&#xA;library.  If this is what you want to do, use the GNU Lesser General&#xA;Public License instead of this License.&#xA;