traxer for revisions of the patch in #326569

patch from ooh_truck in #746295

#382758, reported by skyredwang: Allow the user to hide all fields, not just "real" fields, on the location address field.

This is a bit of a band-aid fix. The problem was due to me changing the implementation at the last moment when designing it.
The original plan was to use a multi select, but that didn't play well with ajax. The query function still relied on the format
that would return sometimes.

This involved a lot of interesting code, and quite probabaly still has some lingering bugs. I'm very happy with how it turned out, though.

* 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.

Further refinement of views support.
Reimplementation of the 'location_directory' default view.
REMOVAL of the 'additional' field -- It is now part of Street.
Fixing sortability in the 'location_table' default view.