relax SVN archive

Converted all of the rdc related functions to the interatomic data container design.

Updated all N-state model analysis references to RDCs and NOEs to use the interatomic data containers.

This is mainly for the methods reliant on the base_data_loop() iterator.

Fixes for the N-state model optimisation target function code for the interatomic data design.

Fixes to the N-state model minimisation setup and execution code for the interatomic data design.

A few small changes to the spin IDs used and the print out from the rdc.read user function.

Modified InteratomContainer.id_match() to handle a single spin ID and to match to all unique IDs.

This uses the spin container _spin_ids list private metadata structure.

Small comment change.

Fixes for the J(w) mapping and consistency testing analyses for the return_interatom() changes.

Fixes for the model-free code for the return_interatom() changes.

Fix for the XML loading backwards compatibility hook for the return_interatom() changes.