Addressing some change requests from @promano.
Addressing some change requests from @promano.

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