Added distance to boundary for cones.
Added distance to boundary for cones.

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