Fix map centering when editing locations with LOCATION_LATLON_UNDEFINED coordinates.
See [#317159]

* 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.

Although I can't fix the update warnings proper, I can inform the user why they happen, reduce them, and repair the stuff reported in #317823.

Tested on MySQL and PostgreSQL.
Please be careful until this code is fully proven!

Split token support into its own include file.
Fix views 2 support for location_fax and location_phone.

Fix how defaults are used when expanding location elements. This eliminates warnings after enabling location_phone / location_fax, and lets 'collection default' work as intended.

Fix #314835, reported by marcoBauli: Make collapsibility work again. I had accidentally broken this while fixing notices.  Additionally, collapsible now works on single-location forms.

Remove colons from field titles in the default views, add a redesigned usernode view (it uses users instead of usernodes.)

Add 'allow empty' to the lid filter so the additional filter options appear.

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.