relax SVN archive

Python 3 bug fix for the N-state model target function setup.

The num_tensors variable needs to be an integer, but the Python 3 division will create a float type.

Python 3 fix for the reading of text from a bz2 file.

In Python 3, the readlines() function was returning a list of bytes types, not a list of strings.
The relax_io.extract_data() function now detects this and converts to string when possible.

Python 3 fix for the results.read user function matching that of state.load at r17666.

Python 3 bug fix for the relax_io.read_spin_data() function.

The built in max() function cannot handle the value of None, therefore the filter() function is used
to remove all instances of None from the list.

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.