relax SVN archive

Fixed the spin.create() user function unit test of the res_id arg.

Added a unit test for the proper failure of the spin.create() user function for the res_id arg.

Fixed the spin.create() user function unit test of the spin_num arg.

Added a unit test for the proper failure of the spin.create() user function for the spin_name arg.

Added a unit test for the proper failure of the spin.create() user function for the spin_num arg.

Set up the residue functions to be used by the molecule unit tests (this is a bad design)!

Fixed a small bug.

Removed a problematic and unused import.

Updated the generic_fns.test_molecule unit test module to use the newly created base class.

Created, by copying, a base class for testing both the generic_fns and prompt molecule modules.