SCHISM post-processing workflow step: merging outputs using combine_output11

[janahaddad]

@Armaghan-NOAA The program to use for merging the outputs is combine_output11. Make sure that you load the same modules you loaded when compiling ufs-coastal before running the above program. Example: module use YOUR_UFS_COASTAL_DIR/modulefiles and then module load ufs_hercules.intel.

Run combine_output11 -h to see the available options. Change directory where the outputs directory is loacated (not inside outputs); combine_outpt11 is searching for an outputs directory. Then run the program to generate the combined output files.

Merging the outputs generate the overall netcdf output file that contains the data for all times including the timestamps.

Originally posted by @pvelissariou1 in #75

Note this is a necessary step when using OLDIO. At some point UFS Coastal needs to provide support for the NEWIO option in SCHISM which doesn't require running combine_output after a run