Added capability to plot meshlines
Removed unused variable
Updated users guide for meshline plotting
Added commented-out example of meshline plotting
Added support for setting the color of a meshlines plot overlay
Updated plot documentation for colored meshlines
Merge branch 'develop' into plot_meshlines
Added support for other slice orientations
Switched to pointer for plot mesh
added cmfd section to theory which includes notation section
added support for tikz extension in sphinx and included first part of theory section
added calc of macro xs section
added more content up to toy problem
added last toy problem
Merge branch 'develop' into plot_meshlines
Added support for plotting ufs, entropy, and cmfd meshes
Allowed read_tallies_xml to run in plotting mode, only to read mesh info
Updates documentation for meshline plotting
removed $ from docs
Clarified documentation