Changed variables in get_next_bin.
Changed variables in get_next_bin.

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