Installation documentation update

Improved documentation for verifying installation of DART.

Bug-fix for NetCDF variables with NaN attributes

• Fix for checking attributes of NetCDF variables that have a NaN as the missing value or _FillValue.

Per-obs-type localization for 3D Cartesian location_mod

Optional per-obs-type localization for 3D Cartesian location

Contributed by Jon Labriola for use with CM1

MITgcm_ocean NBLING

• MITgcm_ocean interface updated to Manhattan.
• Support for NBLING (ocean biogeochemistry) for MITgcm_ocean.
• New observation converter for ocean color.

CLM5-DART Tutorial

• CLM5-DART tutorial providing new users with 13 steps for download, setup, execution, and diagnosis of a simple
  global assimilation run.

• Stage_cesm_files script corrected to re-stage prior inflation files correctly and provide reproducibility

Tracer advection model

• Added a tracer advection model based on Lorenz-96 using a Semi-Lagrangian scheme. The lorenz_96_tracer_advection model_mod was implemented by Fairuz Ishraque as part of a SIPaRCS 2021 project.

• Forward operator documentation updated to Manhattan

Bug-fix for fixsystem for NAG compiler

Fix formatting of code blocks used when compiling mpi/null_mpi_utilities_mod.f90 with the NAG compiler.

CM1 and 3D Cartesian location_mod updates

Contributed by Jon Labriola

• Updated CM1 model_mod to use mixed-case boundary conditions, for example
  periodic in the x-direction but non-periodic in the y-direction.
• Added capability to CM1 model_mod to interpolate 3D fields such as reflectivity.
• Added capability to use multiple localization radii to threed_cartisian
  location_mod.
• Bug-fix for threed_cartesian location_mod for periodic boundaries.

CLM Snow Water Equivalent

• Updated Community Land Model (CLM) model_mod, scripting, and diagnostics.
• New capability to repartition snow layer mass and dimension variables.
  The repartitioning ensures that the adjustments applied to the snow layers
  are consistent (mass and dimensions are conserved) with the adjustment of
  the total snow water equivalent.
• New observation converters for NASA_Earthdata and NSIDC
• Support for netcdf _FillValue
• Bug-fix for clm nc_write_model_atts lon vs nlon

bug fix for inf_flavor namelist option

Namelist option inf_flavor reverted to integer only vs. character or integer to conform to Fortran standards.