[Fix Bug 1022637] Only call reverse_geocode when location data has changed.
Refactor edit profile location tests a bit
[Fix Bug 1027489] If city is set to save when editing profile, save region as well.
[Fix Bug 1022630] Give new countries codes from product_details and allow admin modification for edge cases.
[Bug 1027489] Raise ValidationError if city is set to save without region, and fix test formatting.
Merge pull request #977 from Sancus/more-geo-fixes

[geolocation] Fixes for Bugs 1022630, 1027489, and 1022637