Author: Tim Hunt
MDL-31080 quiz editing, must be able to see and delete missing questions
http://git.moodle.org/gw?p=moodle.git;a=commit;h=d16597b557c5dae4037ff90970977838ea1f7d1a
http://github.com/moodle/moodle/commit/d16597b557c5dae4037ff90970977838ea1f7d1a
+ 2.2 en [missingquestion,mod_quiz]