more changes to sampling
more changes to sampling

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