relax SVN archive

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.

Added a docstring to the Test_diff_tensor class.

Removed the ability for stand alone execution of the diffusion tensor data structure unit tests.

Stand alone execution is unnecessary as the command:

$ ./unit_test_runner.py data/test_diff_tensor.py

will run the tests.

Three things have been changed. Firstly the system path modifications have been removed. Secondly
the 'if __name__ == "__main__":' block has been deleted. Finally the 'svn:executable' property has
been removed from the repository.

Added the 'generic_fns/' directory to the unit test hierarchy.

Deleted the Pipes class and converted all its methods into module functions.