Fix lookups on cck fields.

Fix #1187044 by edxxu: Add support for Proximity/Distance field to use the latitude/longitude distance argument. (Support for using the argument in zipcode mode not included.)

Issue #1211648 by hutch: Notice: Undefined property: stdClass:: in location_views_proximity_get_reference_location().

#467412 by q0rban, j0rd - Add the ability to "Limit list to selected items" for Location: Country views filter.

#790826 by lotyrin - Change latitude and longitude views filters to use the float handler instead of the numeric handler.

#718928 by ankur, rooby, hutch, nicholasThompson, evan23, - Overhaul of views field/sort/filter proximity handlers so they have the same options.  Added options to use views arguments or php code for the origin coordinates.

#606342 by Dustin Currie, gravisrs, matt2000, totsubo, corona ronin, hutch, rooby et al. - Add views argument handler for proximity.

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.

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.

Start of views include.