* Implement multiple country autocomplete.
* Allow location_province_code() to operate on an array of countries.
* Extend autocomplete to handle setting specific classes to join country and province fields together -- should be more robust.
* Switch to using views "force single" stuff for country and province filters.
  - If you are having trouble editing country or province filters, please see [#341827]!
* Implement autocomplete for views province filter.