Bug fix for the xml_create_pipe_element() method.
Converted the display() function to the new relax design.
Removed some debugging code.
Fix for the xml_create_element() method.
Removed a few elements from the __mod_attr__ list.
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.