relax SVN archive

Python 3 bug fix for the state.load user function.

The header line of pickled states (rather than the standard XML states) is of the b'' byte format.
This is now converted to a string, and the search expression is comparing it to the raw string
r"<\?xml".

Better support for both Python 2 and 3 in the relax data store.

The 2to3 script was used on all of the files in the data package.

Python 3 preparation - the relax data store (the data package) now supports both Python 2 and 3.

The command used was:
2to3 -w data/__init__.py

Python 3 fix - the relax_errors.AllRelaxErrors object is now a proper tuple.

Due to bad coding, it was previously a nested tuple. This nested tuple worked in Python 2, but is
fatal for Python 3.

Python 3 fixes - the character '\' is now properly escaped as '\\' in the stereochemistry auto-analysis.

Fix for the test suite summary for Python 3.

The test suite now runs, but fails miserably, under Python 3.

Copyright update.

Fix for the running of the test suite under Python 3.

The zip() function used in the loadTestsFromTestCase() function is now an iterator, so it needs to
be passed through the list() function to generate a list.

Fix for the test_parse_token_multi_element_name() unit test, as parse_token() no longer sorts.

Python 3 fix for the generic_fns.mol_res_spin.parse_token() function.

Mixed lists for int and string can no longer be sorted. This sort call is not needed anyway.