[DO NOT MERGE] Add debug code

[ma595]

Visualisation PR of debug approach for @amangupta2.

[ma595]

! Users should add all user specific namelist changes below in the form of
! namelist_var = new_namelist_value

use_gw_nlgw=.true.
gw_nlgw_model_path='/glade/u/home/matta/CAM/non-local/nonlocal_gwfluxes/era5_training/nlgw_ann-cnn_gpu_scripted.pt'

! nhtfrq=0,-24
! mfilt=1,1400
!

nhtfrq = 0, -24, 1
mfilt  = 1, 1400, 1
interpolate_output = .true., .true., .true.
fincl3 = 'UTGW_NL:I', 'VTGW_NL:I'
fincl2 = 'U:I','V:I','T:I','UTGW_NL:I','VTGW_NL:I'
fincl1 = 'UTGW_NL:A', 'VTGW_NL:A'

!nhtfrq = -1
!mfilt  = 1
!fincl1 = 'UTGW_NL:I'


! nhtfrq = 6
! mfilt  = 4