Added new consistent scattering matrix classes to openmc.mgxs
Added new consistent scattering matrix classes to openmc.mgxs

bhermanmit/openmc,smharper/openmc,walshjon/openmc,smharper/openmc,shikhar413/openmc,mit-crpg/openmc,smharper/openmc,liangjg/openmc,paulromano/openmc,wbinventor/openmc,amandalund/openmc,johnnyliu27/openmc,mit-crpg/openmc,liangjg/openmc,johnnyliu27/openmc,shikhar413/openmc,amandalund/openmc,walshjon/openmc,bhermanmit/openmc,liangjg/openmc,paulromano/openmc,wbinventor/openmc,wbinventor/openmc,walshjon/openmc,paulromano/openmc,johnnyliu27/openmc,johnnyliu27/openmc,liangjg/openmc,paulromano/openmc,smharper/openmc,walshjon/openmc,shikhar413/openmc,amandalund/openmc,amandalund/openmc,wbinventor/openmc,mit-crpg/openmc,mit-crpg/openmc,shikhar413/openmc