All the heteronuclear T1 tags are now initialised.
Fix for the v3.0 relaxation class.
Clean up of the NMR-STAR python objects.
Import fix for the v2.1 relaxation module.
Fix for the v2.1 T1 tag category.
Split the v2.1 heteronucl_T1_relaxation saveframe into its own module.
Expanded the heteronuclear T1 v3.1 module to include all tag names.
The version string is now being printed, rather than recreating it.
The sub-revision number is now also extracted and stored.
Added the v2.1 _Molecular_mass tag.
