relax SVN archive

Converted the mod_attr list into a class variable.

Added the ability to create XML elements for alignment tensors.

Added the results.write() user function to the 5 state model system test script.

Blacklisted the diffusion tensor 'type' variable.

Updated the module docstring.

Shifted the data.relax_xml.read() fn to Relax_data_store.xml_read().

Shifted create_str_elem() to PipeContainer.xml_create_str_elem().

Fixes for the Element.__repr__() method.

Shifted the create_diff_elem() fn to the DiffTensorData class.

Renamed a number of variables and methods.