A general description should go here...
gridflag_config.py [-h] [-d DIRECTORY] [-f] visibility_grid psf_grid pcf_grid
positional arguments:
options:
-h, --help show this help message and exit
-d DIRECTORY, --directory DIRECTORY
The path to the working directory, all other specified paths will be relative to this one.
-f, --fast use the fast (vectorised) algorithm.