relax SVN archive

Modified the NOE restraint list so that some restraints are spread across 2 lines.

This should test the Xplor parsing code better.

Fixes for the test_read_xplor_rna() system test.

The NOE restraints are now stored in the current data pipe.

Typo fix. 'H4' should have been 'N4'!

Added checks to make sure spin containers corresponding to the Xplor atom strings exist.

Created __convert_to_id() to convert from Xplor atom string to relax atom id.

Created the Xplor module for handling Xplor formatted files.

The function parse_noe_restraints() has been added to parse the NOE restraints. The function
strip_comments() has been written to remove Xplor comments from the input data.

Reverted to calling file.readlines() rather than file.read().

The non-implemented function generic_fns.xplor.parse_noe_restraints() is now being called.

Wrote the __file_format() function for determining the NOE restraint file format.