relax SVN archive

Preparation of the prompt.spin and generic_fns.spin base class.

Copied test_suite/unit_tests/generic_fns/test_spin.py to create a base class for the prompt as well.

Fixed the printout of the spin.create() user function.

Fixed the printout of the spin.renumber() user function.

Fixed the printout of the spin.rename() user function.

Bug fix for the spin.rename() user function.

The generic_fns.spin.create() function was being called instead and the non-existent spin_num
argument was being passed into it.

Bug fix for the spin.renumber() user function.

The generic_fns.spin.create() function was being called instead and the non-existent spin_num
argument was being passed into it.

Big, big bug fix!

The prompt.spin module was importing the residue rather than spin module from 'generic_fns/'.

Fixed a bug in the spin.create() user function.

The residue ID string was been checked if it was a string. It can also be None!

Fixed a bug in the spin.diplay() user function.

The spin ID string was been checked if it was a string. It can also be None!