relax SVN archive

Print out improvements for the relaxation data pack_data() function.

More BMRB function conversions for the interatomic data design.

The generic_fns.mol_res_spin.index_molecule() function now handles no molecule name given.

If no name is given and only a single molecule is in the current data pipe, then the index of 0 will
be returned.

The sequence.attach_protons user function now ignores spins with pre-existing attached protons.

Fixes for the model-free analysis bmrb_write() method for the interatomic data design.

Fixes for the relaxation data bmrb_write() function for the interatomic data design.

Improvement for the generic_fns.interatomic.return_interatom_list() function.

The spin ID matching is now through the id_match() function, allowing unique but different spin IDs
to be used. This now matches the return_interatom() behaviour.

Fix for the model-free back-calculation of relaxation data for the interatomic data design.

The overfit_deselect() method needs to be called to deselect the proton spin containers.

Updated the Diffusion_tensor system test scripts to the interatomic data design.

Bug fix for the generic_fns.interatomic.copy() function for when no interatomic data exists.

This now returns without doing anything rather than raising a RelaxError.