[Fix bug 976330] - Add location entering UI to edit profile page

* Will need a valid Mapbox ID added to the settings
* If running locally, add this to local.py:

    CSP_DEFAULT_SRC += ('http://*.mapbox.com',)

* There are notes in the README about converting existing data and what will need to be done afterward.
* There's an attempt to make searching on place names continue to work, and privacy settings for city, region, and country name, but we didn't have time to test those change at all.