added input gauss_seidel_tolerance to replace atoli and rtoli
added input gauss_seidel_tolerance to replace atoli and rtoli

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