User manual

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.

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

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.