relax SVN archive

Bug fix for the vector_dist() function.

The PyMOL structure loading command should not use the file root but the full file name!!! A few
unused 'id' file root variables were also deleted.

Missing import!

Removed the non-existent frq arg and a docstring clarification about the relax formatted file.

Fix for the call to noe.read_restraints() in test_read_xplor_rna().

Final fixes for the rna_seq() sequence generation method.

Another bug fix for the rna_seq() sequence generation method.

Bug fix in the rna_seq() method.

Activated the Noe_restraints system test framework.

Completed the test_read_xplor_rna() system test.

Checks for the restraint list have now been added.

Renamed all the noe.read_constraints() references in the unit tests to noe.read_restraints().