Merge 'CONRAD/investigate_adjust_ps' (PR #6063)

This is an incremental change to introduce adjustment of dp3d
instead of adjustment of ps.

adjust_ps is still used for preqx (forcing was never rewritten),
rsplit=0 (only adjust_ps is possible), or EAM (to not touch every test).

Fixed bugs in forcing_ut init, testing it only
with adjust_ps=false option.

[non-BFB] for HOMME tests with baselines (with moist forcing
and some without nontrivial forcing, because even zero forcing
is processed differently for adjustment of dp3d).

components/homme/src/share/prim_driver_base.F90

@@ -1621,8 +1621,9 @@ subroutine applyCAMforcing_tracers(elem,hvcoord,np1,np1_qdp,dt,adjustment)
   adjust_ps=.true.     ! preqx requires forcing to stay on reference levels
 #endif
 
-#ifdef CAM
-  adjust_ps=.true.     ! For CAM runs, require forcing to stay on reference levels
+#if defined(CAM) && !defined(SCREAM) 
+  adjust_ps=.true.     ! Special case when CAM is defined, and SCREAM is not defined, 
+                       ! require forcing to stay on reference levels no matter dt_remap_factor
 #endif
 
   dp=elem%state%dp3d(:,:,:,np1)