Removed zipcode checking from geolocation

Zipcodes are not a reliable source of information.
Merge remote-tracking branch 'upstream/master'
Removed references to zipcodes
Excised mentions of zipcode from geocoding
Remove unnecessary zipcodes, restore necessary

Some "zipcode" fields are retained to keep the same output format as
before. However, they should all now return an emptry string, clarifying
that there is no actual information in the field. The 0 used before was
potentially confusing.
Update integration tests for removed zipcodes

The zipcode fields should now consistently be ""
Remove obsolete function
Updated unit tests for zipcodeless geocoding