To Test:
1. Disable Amazon and Google bookcovers
2. Enable Baker and Taylor images
3. put SOMETHING in the BakerTaylorBookstoreURL system preference
4. check the source of opac-results.pl and opac-detail.pl, and see that SOMETHING in place between "https://" and the normalized ISBN
Signed-off-by: Nicole C. Engard <nengard@bywatersolutions.com> Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>