relax SVN archive

Added a unit test for copying spins between residues and improvements to 'test_spin.py'.

Wrote a unit test for checking the copying of spin data between molecules.

The spin user function class is now accessible from the prompt.

Copied the residue user function module to the spin module.

Removed the prompt.spin module. This will be replaced by the current residue module instead.

Removed the useless read(), sort(), and write() spin user functions.

These were remnants of the copy from the original sequence user function module.

Copied the GPL 'COPYING' file to the 'minimise' dir to prepare to copy this code to the minfx project.

Added the setUp, tearDown, and setup_data functions for the unit tests of 'generic_fns.spin'.

Added a docstring to the 'self.setup_data()' function.

Updated the 'self.setup_data()' docstring.