Author: Russell Boyatt
MDL-66899 quiz: Log a regrading event when quiz attempt is regraded.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=fad72d7177bae3f3f0e2270c6585b2a8ac5325ce
http://github.com/moodle/moodle/commit/fad72d7177bae3f3f0e2270c6585b2a8ac5325ce
+ 3.9 en [eventquizattemptregraded,mod_quiz]