relax SVN archive

Created the front end for the new structure.displacement user function.

This is used to calculate the rotational and translational displacement between two models.

Extended the N-state model analysis to allow a separate paramagnetic centre per state.

Bug fix for the pymol.cone_pdb user function for when there is no average domain position.

This is necessary for the old 2-domain N-state model analysis type.

Bug fixes for the n_state_model.cone_pdb user function.

The code was old and not functional any more.

Added checks for the n_state_model.cone_pdb user fn in the N_state_model.test_5_state_xz system test.

Created the Frame_order.test_cam_free_rotor system test for the CaM synthetic data.

Created a script for animating the CaM free rotor frame order model test data in PyMOL.

Added the frame order free rotor optimisation script and its results.

The structure.read_pdb user function can now handle bzip2 or gzip compressed PDB files.

Calculated the pure RDC tensors for the free rotor CaM frame order model.