Updated the grace.write() user function interface to the new design.
Converted the Grace write() function to the new design.
The pipe argument is now optional for RelaxNoSimError.
Converted the 4 write_*() functions to the new design.
Converted the view() function to the new design.
Converted the get_data() function to the new relax design.
Converted the determine_graph_type() function to the new relax design.
Converted the Grace class methods into module functions.
Modified the set_error() base class method to accept the spin container.
Modified the sim_return_param() base class method to accept the spin container.