TPac; indicate search results previously checked out

TPac; indicate search results previously checked out

When a user is logged in to the tpac and performs a search, indicate in
the results set when any of the result items were ever checked out by
the logged in user.

Items will only be tagged when the related org setting is enabled and
the user has opted-in to circ history tracking.

New org unit setting is "opac.search.tag_circulated_items" /
"Tag Circulated Items in Results"

In the search results, just below title/author/callnumber/copy-count, a
new line is displayed that says "I have checked out this item before"
with a purdy little checkmark.

Signed-off-by: Dan Scott <dscott@laurentian.ca>