Changes

Reducing C_wp2_splat to 0.25 (from 2.0) for new implicit splatting code.

Also fixing bug that shows up when l_brunt_vaisala_freq_moist = T.  This
will hopefully help to get some failing CAM tests running again.

See #1074 and PR #1075 for info.

This is BIT_CHANGING for all cases due to the new tunable parameter value.