Added voxel plot binary specification to devguide
Added voxel plot binary specification to devguide

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