Renaming regular mesh variables for clarity.
Renaming regular mesh variables for clarity.

mit-crpg/openmc,smharper/openmc,amandalund/openmc,amandalund/openmc,paulromano/openmc,walshjon/openmc,paulromano/openmc,paulromano/openmc,shikhar413/openmc,liangjg/openmc,liangjg/openmc,mit-crpg/openmc,shikhar413/openmc,smharper/openmc,walshjon/openmc,paulromano/openmc,mit-crpg/openmc,shikhar413/openmc,liangjg/openmc,mit-crpg/openmc,walshjon/openmc,liangjg/openmc,amandalund/openmc,walshjon/openmc,smharper/openmc,amandalund/openmc,smharper/openmc,shikhar413/openmc