Support linking to library info from copy display

Support linking to library info from copy display

If the "Library information URL" library setting has a value, then the
copy display section of the TPAC and KPAC will turn the library name
for that branch into a link to the given URL. This supports the patron
goal of quickly finding branch information such as hours of operation,
directions, and contact information.

Signed-off-by: Dan Scott <dscott@laurentian.ca>
Signed-off-by: Kathy Lussier <klussier@masslnc.org>
Signed-off-by: Dan Scott <dan@coffeecode.net>