LP1753536 - Add a new Owning Library column to the OPAC Items Out

LP1753536 - Add a new Owning Library column to the OPAC Items Out

This new column indicates which library owns the materials, and is
intended to help the patron contact the owning library should they be
out of renewals and would like an exception made.

Also adds some utility code for generating an org unit URL.

Make the presence of the column controlled by an organizational unit
setting.

Signed-off-by: Dan Pearl <dpearl@cwmars.org>
Signed-off-by: Jason Stephenson <jason@sigio.com>
Signed-off-by: Galen Charlton <gmc@equinoxinitiative.org>