relax SVN archive

Small comment fix.

Lots of simplifications to the generic_fns.spin.copy() function.

The generic_fns.residue.create() function now allows residues to be added to different molecules.

One of the comments was incorrect.

Small simplification to the generic_fns.spin.create() function.

Completed the generic_fns.residue.create() docstring.

Completed the generic_fns.spin.create() docstring.

Simplification of the loops in the generic_fns.residue.renumber() function.

Simplified the loop of the generic_fns.residue.rename() function.

Simplified generic_fns.molecule.display().

The function was also updated to the same format as the equivalent residue and spin functions.