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
Removed n_batches from statepoint
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
Added error for restarts with small n_batches
Clarified documentation
Tidied up select case
Added intent
Bumped version number to 0.6.1.
Update release notes with latest bug fix.