 Made consistent nu-scatter matrix use tracklength tallies with ScatterXS and MultiplicityMatrixXS
 Made consistent nu-scatter matrix use tracklength tallies with ScatterXS and MultiplicityMatrixXS

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