Bug 9660 - OpenLibrary covers are too small on OPAC search results

Bug 9660 - OpenLibrary covers are too small on OPAC search results

Signed-off-by: Frédéric Demians <f.demians@tamil.fr>
Works as advertised. OpenLibrary book cover API offers 3 cover sizes: small,
medium, and large. Switch from small to medium, for result page, with
downsizing.

Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Improves display of OpenLibrary covers in OPAC result list.
All tests and QA script pass.
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>
Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>