relax SVN archive

Shifted most of the PipeContainer.xml_write() method to the Relax_data_store.xml_write() method.

Fixed some import statements.

Updated the Relax_data_store.__repr__() method.

Shifted and renamed the XML module.

Shifted the xml import statements.

The PipeContainer __repr__() and is_empty() methods can now automatically skip new class methods.

The Prototype.__deepcopy__() method can now automatically skip any new class methods.

Fix for the prototype __deepcopy__ method.

Fixes for the PipeContainer methods.

Shifted the generic_fns.xml_data_pipe.write() fn to the PipeContainer.xml_write() method.