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