Author: Stephen Bourget
MDL-35280 Quiz: Allow course reset to remove overrides
http://git.moodle.org/gw?p=moodle.git;a=commit;h=113486d2eb1f59a91eddf0f40bd1113261c27b4f
http://github.com/moodle/moodle/commit/113486d2eb1f59a91eddf0f40bd1113261c27b4f
+ 2.9 en [groupoverridesdeleted,mod_quiz]
+ 2.9 en [removeallgroupoverrides,mod_quiz]
+ 2.9 en [removealluseroverrides,mod_quiz]
+ 2.9 en [useroverridesdeleted,mod_quiz]