CICE model_mod refactor

[hkershaw-brown]

Goals:

• use get_dart_vector_index to get state vector offset
• use quad_utils module (place to fix interpolation)
• Ncat loops, cat signal - only keep what is needed for the calculation.
• get dimension from state variable, rather than case statement on qty.
• netcdf utilities

Hanging out:

• There is a @todo DEPRECATE for use_default_state_variables

  DART/models/cice/model_mod.f90

  Lines 2531 to 2532 in 33c310b

  	!> Default state_variables from model_mod.
  	!>@todo DEPRECATE

[hkershaw-brown]

branch: https://github.com/NCAR/DART/tree/ice-refactor

[hkershaw-brown]

todo @hkershaw-brown POP vs. CICE vs. quad_utils_mod same/different.

[hkershaw-brown]

If cat_index > Ncat? fail?

DART/models/cice/model_mod.f90

Lines 850 to 856 in 33c310b

	if (obs_type == QTY_SEAICE_CATEGORY) then
	if (cat_index <= Ncat) then
	istatus = 0
	expected_obs = cat_index
	RETURN
	endif
	endif

[hkershaw-brown]

Does not seem like you can reach this code, cat_signal is never -2

DART/models/cice/model_mod.f90

Line 948 in 33c310b

if (cat_signal == -2) then

[hkershaw-brown]

note obs_def_cice.f90 initilize_module call #842

[hkershaw-brown]

volume vs. thickness observation FIXME:

DART/observations/forward_operators/obs_def_cice_mod.f90

Lines 6 to 7 in c5600dc

	!>@todo FIXME: check to see if obs are of volume or thickness - for now we
	! will assume volume.