error occurs when an observation is taken exactly at midnight UTC (00:00). This causes a problem to calculate the n value because hr and mi variables are empty. I made a quick fix by setting n value to 24 if an observation is taken at midnight.

Removed bug in add_model_data_mismatch. Without the  do-not-simulate flag in sites_and_weights.rc file the complete data list was returned instead the trimmed down list that is filtered.

Removed bug in add_model_data_mismatch. Without the  do-not-simulate flag in sites_and_weights.rc file the complete data list was returned instead the trimmed down list that is filtered.

Removed test covariance. Defined a default BC uncertainty of 2 ppm^2 in the covariance matrix. Made sure deviations in BC parameter are now relative to 0.0

added code in serial_least_squares to make surface sites do not update BC, and aircraft sites do not update fluxes

New obspack_globalviewplus.py script which replaces obspack_geocarbon.py for use with the new GV+ ObsPack product. New is the use of obs_flag so that only the (hourly) data that are considered background/representative are assimilated. Local data (obs_flag=0) are set to do-not-use.