Replaced some numerical constants with named constants
Replaced some numerical constants with named constants

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