Bug 14648: Batch remove reserve items

Bug 14648: Batch remove reserve items

Adds "Batch remove items" button to course-reserves.tt. Creates batch_rm_items.pl and batch_rm_items.tt. Allows user to enter a list of
barcode numbers so that they will be removed from all course reserves to which they are attached. A dialog box will provide a warning
before the final deletion is made.

This patch also now moves barcodes that are invalid or not attached to a course reserve to the invalid barcodes output. It also provides
a count of the courses that the deleted items were attached to.

Test Plan
1. Log in as a user with permissions to add and delete course reserves
2. Add the same items to multiple course reserves
3. Go to the main course reserves page (i.e. /cgi-bin/koha/course_reserves/course-reserves.pl)
4. Click the "- Batch remove items" button
5. Enter the barcodes that you added to multiple reserves in step 1
6. Click submit
7. Click Ok if you are ready to delete all of these items
8. Check each course reserve that you added the items to in step 1 to make sure the items you entered were deleted but nothing else
9. Repeat 2-5
10. Add an invalid barcode and a valid barcode that is not attached to a course reserve
11. Repeat 6-7
12. You should see that the items attached to course reserves were removed while the invalid and unattached barcodes were rejected
13. Log out
14. Log in as a user without permission to delete course reserves
15. Go to the main course reserves page (i.e. /cgi-bin/koha/course_reserves/course-reserves.pl)
16. You should not longer see the "- Batch remove items" button

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>