- Turned off autoformat for ANL230/703
 - Moved plotting functionality from reactors to utils.plottting
 - Removed reactors.getAssemTypeLetters as its output was never used.
 - Fixed reactor.getAssemblyPitch so it returns both pitch values
   for reactors with cartesian blocks
 - Added tests for hex/cartesian getAssemblyPitch
 - Added functionality for plotting facemap of cartesian reactors.
 - Added plot functionality to page through differnt assembly depths.
 - Added plotting tests.
 - Added ability to create empty cartesian reactor.

…Cartesian