Bug 11866: do not require special permissions to view course reserves in staff interface

A librarian with no course reserves permissions cannot view course
reserves from the staff intranet, yet can from the OPAC. This doesn't
make much sense. Librarians should not require any course reserves
permissions to view courses and reserves from the staff intranet.

Test Plan:
1) Log into staff intranet as a librarian with no course reserves
   permissions
2) Note you cannot view course reserves
3) Apply this patch
4) Note you can now view course reserves
5) Verify you cannot modify courses or course reserves

Signed-off-by: Owen Leonard <oleonard@myacpl.org>

Bug 11866 [Follow-up] Staff side course reserves too restrictive

This follow-up patch adds a check for the "UseCourseReserves" system
preference to the display of the Course reserves menu item in the
header.

To test, view the "More" menu with the "UseCourseReserves" system
preference on and off. The menu item should appear and disappear
accordingly.

Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>
Bug 11866: (follow-up) ensure that empty toolbar is not displayed

If a user does not have course_reserve permission, a an empty toolbar is
displayed.

Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>
Bug 11866: (follow-up) repair security issue introduced by main patch

The main patch allows /any/ user with an account on the Koha system
to view the staff-side course-reserves home page -- including ordinary
patrons.  This patch repairs the oversight.

Signed-off-by: Galen Charlton <gmc@esilibrary.com>