The most recent NCAR -> GFDL merge created an error (courtesy of myself)
which left the CFC concentration units in the post_data call, even
though these are now handled at registration.

This patch restores this expression and removes the unit conversion from
post_data.

 - Without this, if part of your OBC is filled with land mask and
   if that land mask contains a masked out tile, you will generate
   a NaN from the phase speed calculation where h is negative in the
   halo neighbor of that masked tile.