relax SVN archive

Reverted the last revision (r18737) as it was not correct and RelaxErrors should be used instead.

The command used was:
svn merge -r18737:18736 .

Missing import affecting the generic_fns.interatomic.create_interatom() function.

Bug fix for the maintenance of the spin ID lookup table metadata.

This is important for small molecules. Non-unique IDs were being placed into the lookup table,
resulting in incorrect spin containers being sometimes used. Now the molecule container has the
_res_name_count and _res_num_count metadata and the residue container the _spin_name_count and
_spin_num_count structures. These are updated via metadata_update() and are used by the
spin_id_variants() function to create a list of purely unique spin IDs.

Created the generic_fns.mol_res_spin.return_molecule_by_name() function.

This will be used in the future as it is much faster than generic_fns.mol_res_spin.return_molecule()
if the molecule name is already known.

Redesign of the generic_fns.mol_res_spin.generate_spin_id() function.

The function now tries to generate a unique ID based on the spin information in the specified data
pipe. This is to attempt to fix a bug uncovered by the Structure.test_read_xyz_internal2 system
test. Defaulting in all cases to the spin name rather than spin number will often fail for a small
organic molecule, as the name in XYZ files is the atomic symbol and hence will almost never be
unique.

Merged revisions 18731 via svnmerge from
svn+ssh://bugman@.../svn/relax/trunk

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r18731 | bugman | 2013-03-09 13:11:27 +0100 (Sat, 09 Mar 2013) | 3 lines

Updated the release checklist to include information about updating the FSF directory.
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Modified the release checklist document to use the stable release tags of minfx and bmrblib.

This is instead of the code in trunk which may not always be in a stable state.

Updated the release checklist to include information about updating the FSF directory.

The frame order specific analysis return_error() method can now handle missing errors.

If the alignment ID key is not found in the RDC or PCS data structures, then the value of None is
used instead.

Merged revisions 18728 via svnmerge from
svn+ssh://bugman@.../svn/relax/trunk

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r18728 | bugman | 2013-03-09 11:48:35 +0100 (Sat, 09 Mar 2013) | 5 lines

All of the specific API data and error returning common methods can now handle missing data/errors.

This affects the _return_data_relax_data() and _return_value_general() methods.
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