added rms utility
added rms utility

kellyrowland/openmc,samuelshaner/openmc,bhermanmit/openmc,walshjon/openmc,paulromano/openmc,mjlong/openmc,bhermanmit/cdash,walshjon/openmc,walshjon/openmc,paulromano/openmc,amandalund/openmc,nhorelik/openmc,mit-crpg/openmc,mit-crpg/openmc,mit-crpg/openmc,keadyk/openmc_mg_prepush,samuelshaner/openmc,wbinventor/openmc,mjlong/openmc,keadyk/openmc_mg_prepush,nhorelik/openmc,johnnyliu27/openmc,lilulu/openmc,johnnyliu27/openmc,amandalund/openmc,liangjg/openmc,samuelshaner/openmc,shikhar413/openmc,samuelshaner/openmc,liangjg/openmc,kellyrowland/openmc,sxds/opemmc,lilulu/openmc,sxds/opemmc,shikhar413/openmc,keadyk/openmc_mg_prepush,smharper/openmc,paulromano/openmc,wbinventor/openmc,wbinventor/openmc,paulromano/openmc,johnnyliu27/openmc,shikhar413/openmc,walshjon/openmc,lilulu/openmc,shikhar413/openmc,smharper/openmc,liangjg/openmc,mit-crpg/openmc,liangjg/openmc,amandalund/openmc,shenqicang/openmc,smharper/openmc,wbinventor/openmc,amandalund/openmc,bhermanmit/openmc,smharper/openmc,shenqicang/openmc,johnnyliu27/openmc