Changed reverse iteration of filter bins, indices to use reversed(...)
Changed reverse iteration of filter bins, indices to use reversed(...)

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