Teach output write_tallies about writeable tallies
Teach output write_tallies about writeable tallies

The tally header will still be written, but no summary,
scores, or filters will be written. Instead, the output
will indicate the tally is internal.

walshjon/openmc,shikhar413/openmc,mit-crpg/openmc,liangjg/openmc,mit-crpg/openmc,paulromano/openmc,liangjg/openmc,paulromano/openmc,smharper/openmc,amandalund/openmc,mit-crpg/openmc,liangjg/openmc,shikhar413/openmc,amandalund/openmc,shikhar413/openmc,smharper/openmc,amandalund/openmc,smharper/openmc,walshjon/openmc,walshjon/openmc,paulromano/openmc,liangjg/openmc,paulromano/openmc,amandalund/openmc,mit-crpg/openmc,smharper/openmc,walshjon/openmc,shikhar413/openmc