relax SVN archive

Fixes for the creation of the isotropic cone frame order model PDB representation.

Eliminated the full motional eigenframe of the isotropic cone frame order model.

To define the frame of this motional model, only the central cone axis is required. Therefore the
three Euler angles have been eliminated and replaced by two spherical coordinates of the cone axis.

Fixed an import.

Updated all of the frame order RDC and PCS data back calculation scripts for recent changes.

Converted all three pseudo-elliptical frame order target functions to the new base data design.

Bug fix for the PCS calculation for the isotropic cone frame order model.

The integration SA formula was incorrect. This also affects the free rotor isotropic cone model.

Implemented the isotropic cone, torsionless frame order target function for the new base data design.

Converted the isotropic cone frame order target function to the new base data design.

Deleted the old func_iso_cone_elements() frame order target function.

This was only used for testing, and is of no real use.

Updated the 2nd isotropic cone, free rotor frame order test model optimisation script.