Minor changes to storing boolean array of is_adj_ref directly for each direction
Minor changes to storing boolean array of is_adj_ref directly for each direction

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