Bug 11982 - Images now display properly in the details section.

Bug 11982 - Images now display properly in the details section.

If the a cover image exists, it will be displayed on the details page.
Nothing is displayed of there is no cover available.
    modified:   koha-tmpl/intranet-tmpl/prog/en/js/localcovers.js
    modified:   koha-tmpl/intranet-tmpl/prog/en/modules/catalogue/detail.tt

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Works as described, passes tests and QA script.
Checked Amazon covers and local covers display correctly
in staff on results and detail pages.

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@gmail.com>
(cherry picked from commit 2a4a91aef3ecaacdf3d01dc358f9486b96fba705)
Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>