modified tally merge method to only add unique scores
modified tally merge method to only add unique scores

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