relax SVN archive

Updated the CHANGES file for the new version.

relax version 1.2.14.

This is a minor bug fix release.

Wrote the __minimise_setup_pcs() method.

Modified the N_state_opt class to accept PCS data.

The __init__() docstring has been significantly expanded as well.

Converted minimise_setup_rdcs() and minimise_setup_tensors() into private methods.

Shifted the __update_model() method for fixing the alphabetical ordering of methods.

Fix for the __update_model() method.

This was only working if both RDC and PCS data are supplied.

A call is now made to assemble the PCS data necessary for optimisation.

Changed the way optimisation of the N-state model is set up.

This will allow multiple base data types to be used simultaneously.

Added a module docstring.