added a tally reset routine for user defined tallies
added a tally reset routine for user defined tallies

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