The script `get_base_data` takes the raw datafiles (such as `names.txt`)
and formats them in a common JSON file, which can be later used to
randomly generate customer and meter readings data.
Additionally, the script filters all eligible zip codes an approximate
avacon netz service area and provides some additional information for
them.
An example output file, `base_data.json` has been added to the repo in
a previous commit.
