adding support for a "visible" searching parameter
starting to wire up resource searching functionality
fixes for searching, particularly for locations
disabled search in nav bar for now
adding macros for common rendering functions
resource services fixes

Single retrieval was busted and latest-added retrieval needed to apply
visibility filtering
fixed single resource retrieval and server errors

resource_with_id needed to return the first item, as search returns a
list.  In addition, the abort needed to be imported into radremedy.py
Updating search forms/provider display

Provider display now uses the appropriate macro, and search forms now
work as you would expect (albeit in a very limited form)