relax SVN archive

Added a copyright notice and a function for returning the SVN revision number to the version module.

Updated the GeneralRelaxation saveframe to be more in the NMR-STAR v3.1 style.

Reworked the entire GeneralRelaxation saveframe code.

Now a rudimentary NMR-STAR v3.2 formatted file is able to be produced and read back in.

Added a docstring to tag_setup().

Improved the error handling for AICc model selection.

The code now tells users with too small datasets (n<=k) why AICc model selection does not work in
their situation.

This follows a discussion started at:
https://mail.gna.org/public/relax-devel/2009-10/msg00015.html
(# Message-id: <4ACD6F60.7060102@...>)

Shifted pystarlib into bmrblib.

The pystarlib software is only used by bmrblib. This also prepares for bmrblib to be spun off as
a stand alone project.

Fix for the NMR_STAR_v3_2 class set up.

This should have been using Relaxation_v3_2.

Modified the BMRB read/write system test to use the bmrb.read() version arg.

Also reverted the default version number to 3.1.

Introduced the version arg to the bmrb.read() user function.

This is mainly useful for debugging.

Added the missing 'ChiSquaredVal' to the tag_names structure for the base class.