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=28509546d368f15337b38adc36e323fb06a66e4f
http://github.com/moodle/moodle/commit/28509546d368f15337b38adc36e323fb06a66e4f
+ 3.8 en [eventquizattemptregraded,mod_quiz]