To compile:

1) create symlink to Makefile.conf for your platform (zeus, jet or wcoss). For
   example, on theia

   ln -fs Makefile.conf.theia Makefile.conf

2) make sure the relevant modules are loaded on theia, i.e.

   module load intel
   module load netcdf

3) To compile global_enkf (for GFS model) run 'make -f Makefile_gfs'
   To compile wrf_enkf (for WRF ARW/NMM or HWRF) run 'make -f Makefile_wrf'
   To compile wrf_nmmb (for NAM/NMMB) run 'make -f Makefile_nmmb'

Some import namelist variables:

use_gfs_nemsio (logical):  Use nemsio instead of spectral files for GFS (default .false.)
regional (logical): replaces old variable 'wrf_regional'.  Use regional model instead of GFS or NMMB. Default .false.
nmmb (logical): Use nmmb model (either global or regional). Default .false. 
arw (logical): Use wrf-arw model if regional=.true.  Default .false.
nmm (logibal):  Use nmm core (HWRF) if regional=.true.  Default .true.

Analysis variables are determined by reading the 'anavinfo' file (same as that
used by GSI). The EnKF uses the 'control_vector_enkf:' table.

See the comments in params.f90 for other namelist variable definitions.
