Added commented-out example of meshline plotting
Added commented-out example of meshline plotting

lilulu/openmc,shikhar413/openmc,amandalund/openmc,wbinventor/openmc,johnnyliu27/openmc,amandalund/openmc,smharper/openmc,lilulu/openmc,paulromano/openmc,mit-crpg/openmc,samuelshaner/openmc,nhorelik/openmc,shikhar413/openmc,liangjg/openmc,mjlong/openmc,walshjon/openmc,shikhar413/openmc,bhermanmit/openmc,mit-crpg/openmc,johnnyliu27/openmc,mit-crpg/openmc,amandalund/openmc,samuelshaner/openmc,samuelshaner/openmc,wbinventor/openmc,paulromano/openmc,johnnyliu27/openmc,lilulu/openmc,liangjg/openmc,walshjon/openmc,wbinventor/openmc,liangjg/openmc,smharper/openmc,sxds/opemmc,paulromano/openmc,walshjon/openmc,walshjon/openmc,amandalund/openmc,kellyrowland/openmc,nhorelik/openmc,paulromano/openmc,johnnyliu27/openmc,mjlong/openmc,bhermanmit/openmc,wbinventor/openmc,samuelshaner/openmc,smharper/openmc,kellyrowland/openmc,sxds/opemmc,mit-crpg/openmc,smharper/openmc,shikhar413/openmc,liangjg/openmc