IMPORTANT: Correction for the output observation NetCDF for DART

[arango]

There were couple of issues with the output observations NetCDF file (MODNAME) used in 4D-Var and DART (Kalman filter) to report the model values at the observation locations and other important 4D-Var variables. We need to correct the survey dimension since it was one value too many. And correct the number observations with the same survey time (Nobs). This variable has the wrong dimension (state_var) with the wrong values. It was confused with new variable Nused_obs containing the number of usable (viable) observation per each state variable.

dimensions:
        record = 2 ;
        survey = 13 ;
        state_var = 7 ;
        cost_var = 8 ;
        datum = 6815 ;
variables:
        int Nobs(survey) ;
                Nobs:long_name = "number of observations with the same survey time" ;
        int Nused_obs(state_var) ;
                Nused_obs:long_name = "Number of usable observations" ;

Many thanks to Andy Moore for bringing this to my attention.

[arango]

I missed changing the state variable dimension for NLcost_function in def_mod.F.