relax SVN archive

Restored the reversal of the rotation matrix when determining Euler angles for a tensor in the PDB frame.

Fix for the test_read() unit test of generic_fns.relax_data.read().

The relaxation data structures are now handled differently in this branch and all data structures
have the same from for all spins, even if data is missing.

A few system and unit test fixes broken by recent rearrangements of the diffusion tensor code.

Caught when no diffusion tensor data is yielded by the bmrblib loop() method.

The restoration of the data from BMRB files into data pipes is now fully tested in the system tests.

The relaxation data reading is functional again, matching the new design of bmrblib.

The saveframe description for the relax scripts now says that they are relax scripts.

The spectrometer frequency is now converted to MHz before being sent to BMRBlib.

Fixes for the citations BMRB writing.

The author structure is now split up before sending to the saveframe class.

The reading of entity information from the BMRB file is fixed.