GNU General Public License**************************     	    GNU GENERAL PUBLIC LICENSE     	       Version 2, June 1991          Copyright (C) 1989, 1991 Free Software Foundation, Inc.     		  675 Mass Ave, Cambridge, MA 02139, 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 Library 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.          	    GNU GENERAL PUBLIC LICENSE     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.  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