relax SVN archive

Added two unit tests for the relaxation dispersion code and fixed errors in the corresponding code.

More unit tests will be added soon to help debugging and developing.

Copied 'test_relax_fit.py' to 'test_relax_disp.py'.

This will allow the design of a few unit tests for the relaxation disperison code.

The command used was:
svn cp

Imported the non-existant create_pseudo_spin() function.

Fixes for the arg unit tests of spin.create_pseudo().

Wrote the interface for the spin.create_pseudo() user function.

Wrote 5 arg unit tests for the spin.create_pseudo() user function.

Wrote a unit test for the creation of pseudo-atom spin containers.

Removed the '@' from the pseudo-atom spin names.

Modified the phthalic acid NOE restraint reading test to include pseudo-atoms.

The generically formatted NOE restraint file is now being parsed.