This patch replaces the result page sidebar new-search trees

This patch replaces the result page sidebar new-search trees
(implemented before "faceting" became a thing, and designed for
new-search, not drill-down) with and implementation of what has become
the generally accepted "way to do faceting".  This is implemented as a
Dojo Dijit, and the markup and code footprints within the OPAC proper
are small, just  a couple <div>s and a little bit of glue code to help
the facet rendering engine find the data it needs.  The set and order
of facet classes to display in a given facet bar (title, author,
subject, etc) is configurable in the markup, as are the number of
values displayed for each facet when collapsed (before the [More...]
button is pushed).

Also included is a Searcher Dijit which implements an embeddable
advanced search interface.  This is mainly useful for constructing
boolean-chained searches (we support AND and OR now, though they're
spelled && and || in the query string), and has the beginnings of
support for filters and modifiers.

git-svn-id: svn://svn.open-ils.org/ILS/trunk@17057 dcc99617-32d9-48b4-a31d-7c20da2025e4