relax SVN archive

Modifications to the back-calculation script for the average position.

Added the optimisation results to the repository.

Removed '_pcs_only' from the created files.

Shifted the PCS only script into its own directory.

Created a script for the back-calculation of RDC and PCS data from the PCS only fit average structure.

Created a subdirectory for testing the frame order theory with just PCS data.

Added a script for testing the frame order analysis of the rotor model with only PCSs.

The align_id variable can now be added to the data store alignment tensor object.

Fix for the align_tensor.init user function for when the align_id arg is given.

The incorrect back-end function was being called.

The alignment ID is now set for the N-domain tensors in the frame order test data.