Bug 24854: Remove IDreamBooks integration

Bug 24854: Remove IDreamBooks integration

The IDreamBooks service has not seen updates in a long time, so
we should remove the service from Koha as it's no longer operational.

To test:
- Apply patch and run the database update
- Verify that the IDreamBooks related system preferences are gone
- Verify that opac detail pages and result lists still work
  as expected
- Run t/db_dependent/UsageStats.t

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
Signed-off-by: Bernardo Gonzalez Kriegel <bgkriegel@gmail.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>