This last patch activates the check at client side.
If the pref ProtectSuperlibPrivs is enabled, non-superlibs should not be
able to change superlibrarian privileges via the interface.
 Enable the pref.
 Login as superlib and add/remove superlib privs to a staff user.
 Login as another user (no superlib, but having borrowers, permissions
and staff_access). Verify that you cannot add or remove superlib