relax SVN archive

Rewrote the 'generic_fns.pipes.delete()' function.

Added a tearDown() method to the 'test_suite/unit_tests/generic_fns/test_pipes.py' file.

The relax data storage object is reset as the data added to it from different tests was clashing.
The method allows the 'test_creation_fail' unit test to pass.

Fixed the function generic_fns.pipes.create().

The relax data store singleton method 'add()' has been deleted as the method required the first
argument to be the singleton instance. Instead the functionality has been shifted into the
generic_fns.pipes.create() function. The unit tests have been modified for the new setup.

All references to 'run' in the file 'test_suite/unit_tests/generic_fns/test_pipes.py' have been
replaced with 'pipe'.

Added unit tests for the relax data storage singleton class Data from the 'data' module.

Fixed the problems with the classes of the 'data.mol_res_spin' module.

The add_item() methods of the list type classes have been modified. For the MoleculeList class the
'mol_name' argument has been added and the MoleculeContainer.__init__() method accepts this argument
as well. The 'res_name', 'res_num', 'spin_name', 'spin_num', and 'select' have similarily been
added.

Bug fix.

The import statement for the pipes module has been removed from 'generic_fns.main'.

Added unit tests for the methods of the classes of the module 'data.mol_res_spin'.

Added unit tests for the functions of the module 'generic_fns.pipes'.

Updated the docstring of 'generic_fns.pipes.create' to be in Epydoc format.

Updated the import statements, removing many unused imports.