Updated def_mod.F

[arango]

• The routine def_mod.F, which creates output NetCDF file MODNAME used in data assimilation or verification to write model values at observations locations and other data assimilation variables, was upgraded to check if the input observations have the global attributes state_variables and obs_provenance. Some users are not adding these important metadata information to input observation NetCDF.

• Added new subroutine netcdf_get_satt to module mod_netcdf.F. It is used to read global or variable NetCDF string attribute(s).

• Updated routine read_asspar.F to provide more information when the VERIFICATION option is activated.

[arango]

Updated def_mod.F to have generic code to copy the all the NetCDF attributes for variables obs_type and obs_provenance. These attributes are copied from input observation file using the nf90_copy_att function.