Bug 14237: (follow-up) Make the routines exclusively take itemnumber, biblionumber...

Bug 14237: (follow-up) Make the routines exclusively take itemnumber, biblionumber, or ci_id

This patch changes the parameters for several of the CourseReserves routines to take a single
identifier exclusively.

Following the existing pattern we simply return if the params are incorrect

This patch also:
removes an unused 'title' variable
adds a prefetch to save some db calls where we fetch related objects
adjusts tests

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>