Author: Frederic Massart
MDL-41726 mod_quiz: Replace handlers with observers for group events
This also implements a filtering of the events to be handled when
a course reset has been started.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=11b0c8e0e62750b0c6d4f26448140dc02812577b
http://github.com/moodle/moodle/commit/11b0c8e0e62750b0c6d4f26448140dc02812577b
+ 2.6 en [eventcourseresetended,core]
+ 2.6 en [eventcourseresetstarted,core]