Changes

Likely non-bit-changing housekeeping (#1213)

Non-bit-changing housekeeping regarding wp2 clipping
CLUBB ticket #1165

Renamed threshold_array -> wp2_min_array
Moved upper clipping of wp2 into clip_variance
Added warning outputs where wp2 is hard-clipped
Added debugging checks to hole-filling and wp2_min_array clipping
Some necessary OpenACC-modifications

Reduced the upper bound for wp2_min_array to 1.0
CLUBB ticket #1165

This is BIT_CHANGING for at least the cases ARM_97 and TWP_ICE,
and likely any other more non-standard cases.
This change will prevent the minimum clipping value for wp2 from exploding when l_min_wp2_from_corr_wx=.true.,
and simultaneously reduce the influx of mass to wp2 from clipping while increasing thlp2 and rtp2 a little.