relax SVN archive

Fixes for Tyler's peptide system test.

The residue was 111 in the PDB but 211 in the results file, and the spin was unnamed.

Fix for the return_units() method. The spin and spin_id args are now accepted.

Fixes for all the N-state model optimisation unit tests.

Removed a debugging print out.

Fix for the func_2domain() method for the N-state model tensor reduction code.

Bug fix: The tensor reduction was specified back to front!

Added a check for the chi-squared value for the 5-state model system test.

Fix for the return_units() method.

The spin and spin_id args are now accepted.

Bug fix for the return_units() method, the spin_id keyword arg is now accepted.

Bug fix: The return_units() method now accepts the spin_id keyword arg.