* Fix $op 'delete' on hook_locationapi().
* API CHANGE: Use location_save_locations() with an empty array instead of deleting rows from {location_instance}. This lets us have "real" deletion instead of relying on garbage collection.

Before:
<code>
db_query("DELETE FROM {location_instance} WHERE genid = '%s'", 'mykey:'. $obj->id);
</code>

After:
<code>
$locations = array();
location_save_locations($locations, array('genid' => 'mykey:'. $obj->id));
</code>

* Remove garbage collection routine and UI from settings page. References are checked automatically now.

Split location_search variables out from the main settings page, as they were confusing *ME*, which means that they were probabaly REALLY confusing the *users*.

Rip out the notion of "supported countries." With the dynamic country loading, this isn't really needed.
This breaks some of the "province listing" stuff, but it needed work anyway.

Don't use variable_get('gmap_user_map', '[gmap|center=0,30|zoom=16|width=100%|height=400px]') for the location chooser map. That's just stupid.

Give it its own variable and set the default to '[gmap]' (i.e. inherit everything).