relax SVN archive

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

Fix for the return_data_types() function.

The reference to self has been removed.

Fixed the spin.copy() user function printout.

Shifted the return_data_types() function into its own module for all prompt tests to use.

Wrote a function for returning all different types of data as an array.

This data will be used to test the proper behaviour of the user functions to the handling of their
arguments.

Updated the docstrings of all the unit tests now located in the spin base class.

Updated the unit tests for the generic_fns.spin module to use the spin base class.

Fixed all the spin user function unit tests.

All the unit tests in the spin base class are calling functions from within the object
self.spin_fns. In the spin user function unit test module, this has been set to the
prompt.spin.Spin instantiated class.

Fixed the relax data store import problem/clash in the spin_base_class module.

The singleton is now imported into the data.__init__ module as Data, and hence it can be
subsequently imported by the base class. A bit of a kludge, but it works for now!

Updated the spin user function unit tests to inherit Spin_base_class.