Ability to map location fields from profile to fields in location module

If profile module fields are being used to store a user's location, it'd be nice if we could tap into those from Location module and keep them synced up.

Location module could watch for profile updates and update its user address data whenever needed. We should be able to select which profile fields map to specific location fields (country, city, postal code, address lines, etc). When a user's location is updated, that new address could optionally be set to geocode automagically to save their lat/long information as well.