Properly map `data_type`/`location` codes in *SNCL.py:

There is an ambiguity that exists between `data_type` and `location` in *SNCL.py. Ideally, we'd clean this up, but that involves many changes, and well beyond just the *SNCL.py files. These changes at least fix issues with geomagio scripts that popped up during testing.