relax SVN archive

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.

Fix for the spin.copy() unit test for the failure of the spin_to argument.

Fix for the last commit.

This is the spin.copy() unit test for the failure of the spin_to argument.

Wrote a unit test for the proper failure of the spin.copy() user function spin_to argument.

Wrote a unit test for the proper failure of the spin.copy() user function pipe_to argument.

Wrote a unit test for the proper failure of the spin.copy() user function spin_from argument.