relax SVN archive

Started to convert the Frame Order test suite RDC data to the new interatomic data design.

The interatomic_loop() now skips deselected containers if the new 'selected' flag is True.

This should speed up the function and simplify its usage.

Converted all of the N-state model system and GUI test scripts to the new interatomic data design.

A number of bug fixes for the N-state model target functions.

Debugging print out removal.

The select.interatom and deselect.interatom spin ID arguments can now be set to None.

This allows all interatomic data containers to be either selected or deselected.

Fixes for the _minimise_bc_data() model-free method.

The rdc.read user function can now handle spin IDs in quotation marks.

Converted all RDC data and generations scripts used by the N-state model to the interatom design.

This is the RDC data used in the relax test suite.

Updated the population N-state model system test script to the new interatomic data design.