USC geocoding fix

- Add usc_enrich_location module to remove all but first lat/lon
  spatial value, else clean the values by removing "s.d"
  variations then join all values into one
- Update geocode module to handle values that are already lat/lon
  coordinates
- Updated move_date_values to move "circa" values
- Create a utilities module to hold iterify method
- Restore location enrichment and geocode for USC