relax SVN archive

Bug fix for the frame_order.pivot() user function - it is now functional.

The base contents of the relax data store are no longer saved with a call to results.write().

More fixes for the torsionless isotropic cone frame order model.

Bug fix for the unpacking of results from the torsionless isotropic cone frame order model.

The optimised cone angle was being set to the order parameter in cone_s1.

Fix for the pcs.back_calc() user function for when multiple structures are loaded.

Fix for rdc.read() when neg_g_corr is set to True and the RDC list contains entries with None.

The negative gyromagnetic ratio correction flag neg_g_corr is now available in the rdc.read() user fn.

Better identification of the molecule end in the internal PDB reader.

HETATMs after a TER are now considered part of the same molecule, as they should be.

The sign of the RDC can be inverted to correct for the negative 15N gyromagnetic ratio.

Missing import!