relax SVN archive

Fix for the interatomic data container is_empty() method for the new variables and methods.

Interatomic data containers can now be selected and deselected.

The user functions select.interatom and deselect.interatom have been created mimicking the
equivalent select.spin and deselect.spin functions. Each interatomic data container now has a
select flag.

Modified the interatomic_loop() function so that spin IDs can be used to restrict the looping.

Fix for the N-state model _minimise_bc_data() method for the interatomic data design.

A number of fixes for the N-state model target functions for the interatomic data design.

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.