Changes

It was discovered that the location where the ghost point values
of um and vm were set equal to their respective values at the first
thermodynamic level above the surface was not ideal. Their
assignment occurred before the love nudge (l_uv_nudge). Then,
the love nudge came along and altered their values so that
um(1) no longer equaled um(2) -- and analogous for vm(1) and vm(2) --
for a half dozen cases. In addition to making the code inconsistent,
it also caused bit-for-bitness differences between the master
and clubb_ghost_exorcism branches. For those reasons, this
BIT_CHANGING commit is being made.