Bug 13388: Add library pages to the OPAC

Bug 13388: Add library pages to the OPAC

This patch adds a script and a template for showing library information
pages in the OPAC. A "libraries" page lists all the libraries in the
system, linking to individual pages for each library showing more
information..

If there is only one library in the system the page shows all of that
library's information.

To test, apply the patch and rebuild the OPAC CSS
(https://wiki.koha-community.org/wiki/Working_with_SCSS_in_the_OPAC_and_staff_client).

 - Go to /cgi-bin/koha/opac-library.pl in the OPAC.
 - Verify that all the correct information is displayed for the
   libraries in your system.
 - Verify that page title and breadcrumbs look correct.
 - Click to view details for a library.
   - The details page should show the full contents of
     branches.opac_info
   - A menu should show links to other libraries' detail pages.

EDIT: This revised patch adds a "Libraries" link to the links under the
search bar; Corrects encoding in the breadcrumb link; Makes the page
title more specific when viewing an individual library.

Signed-off-by: Victor Grousset/tuxayo <victor@tuxayo.net>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>