Comment 15 for bug 1736419

Please find a fix for these, as well as bug 1736992, at:

http://git.evergreen-ils.org/?p=working/Evergreen.git;a=shortlog;h=refs/heads/user/miker/lp-1736419-located-uri-search-and-available

From the commit message:

The site() filter and #staff modifier are used to decide when and how to
include certain query filters, such as circ_lib or luri_org. Unfortunately,
site() is sometimes excluded (whole-tree search) and the test for staff-
iness was not specific enough, leading to incorrect queries in those cases
where information was lacking. Now, we treat site() specially, forcing a
default of "top-of-tree", and we check for the #staff modifier directly
where necessary.

Note: this commit also addresses LP#1736992 which is about staff searches
using the limit-to-available modifier. As a side effect of the special
site() treatment, that issue is resolved.