Completed section on distance to boundary calculations.
Completed section on distance to boundary calculations.

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