Fix OMP race conditions and some chkcsum calls

[alperaltuntas]

• Fixes OMP race conditions in:
  • MOM.F90
  • MOM_diagnostics.F90
  • MOM_set_viscosity.F90
• Comments out an OMP parallel do block in MOM_tracer_advect.F90, because, advect_x and advect_y are not thread-safe when computing ad2d_x and ad2d_y diagnostics. TODO: fix this and uncomment OMP directive again.
• Also commented out an OMP parallel do block in KPP module, similarly, due to a thread-unsafe subroutine.
• Fixes CS%Debug = .true. cases by initializing initialize fluid entrainment arrays, and by ensuring chksum for drag_vel is called only if it is allocated.

After these changes, PET tests and tests with CS%debug passes.

[codecov-io]

Codecov Report

Merging #142 into dev/ncar will increase coverage by 4.11%.
The diff coverage is 66.66%.

@@             Coverage Diff              @@
##           dev/ncar     #142      +/-   ##
============================================
+ Coverage     41.13%   45.25%   +4.11%     
============================================
  Files           213      213              
  Lines         63251    63253       +2     
============================================
+ Hits          26020    28624    +2604     
+ Misses        37231    34629    -2602

Impacted Files	Coverage Δ
src/diagnostics/MOM_diagnostics.F90	87.44% <ø> (+0.34%)	⬆️
src/core/MOM.F90	69.39% <ø> (+0.4%)	⬆️
src/parameterizations/vertical/MOM_CVMix_KPP.F90	0.84% <ø> (ø)	⬆️
src/tracer/MOM_tracer_advect.F90	69.03% <ø> (ø)	⬆️
...c/parameterizations/vertical/MOM_set_viscosity.F90	70.57% <ø> (+12.35%)	⬆️
...parameterizations/vertical/MOM_diabatic_driver.F90	58.68% <0%> (+3.32%)	⬆️
src/parameterizations/lateral/MOM_MEKE.F90	68.73% <100%> (+65.86%)	⬆️
src/core/MOM_barotropic.F90	71.37% <0%> (-0.8%)	⬇️
src/initialization/MOM_state_initialization.F90	31.53% <0%> (+0.21%)	⬆️
src/framework/MOM_file_parser.F90	67.58% <0%> (+0.25%)	⬆️
... and 41 more

---

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[npotts]

Codecov Report

Merging #142 into dev/ncar will increase coverage by 4.11%.
The diff coverage is 66.66%.

@@             Coverage Diff              @@
##           dev/ncar     #142      +/-   ##
============================================
+ Coverage     41.13%   45.25%   +4.11%     
============================================
  Files           213      213              
  Lines         63251    63253       +2     
============================================
+ Hits          26020    28624    +2604     
+ Misses        37231    34629    -2602     

Impacted Files	Coverage Δ
src/core/MOM_barotropic.F90	71.37% <0.00%> (-0.80%)	⬇️
src/initialization/MOM_state_initialization.F90	31.53% <0.00%> (+0.21%)	⬆️
src/framework/MOM_file_parser.F90	67.58% <0.00%> (+0.25%)	⬆️
src/parameterizations/lateral/MOM_hor_visc.F90	61.77% <0.00%> (+0.28%)	⬆️
src/framework/MOM_domains.F90	46.68% <0.00%> (+0.33%)	⬆️
src/diagnostics/MOM_diagnostics.F90	87.44% <0.00%> (+0.34%)	⬆️
src/core/MOM.F90	69.39% <0.00%> (+0.40%)	⬆️
src/diagnostics/MOM_sum_output.F90	60.66% <0.00%> (+0.45%)	⬆️
src/framework/MOM_checksums.F90	77.90% <0.00%> (+0.47%)	⬆️
src/tracer/MOM_tracer_flow_control.F90	53.45% <0.00%> (+0.72%)	⬆️
... and 34 more

---

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