Author: Dan Poltawski
MDL-40062 mod_forum: Add discussion_updated event
http://git.moodle.org/gw?p=moodle.git;a=commit;h=97802bea3a7f7c7904f2d0346f6600cc276f9ae6
http://github.com/moodle/moodle/commit/97802bea3a7f7c7904f2d0346f6600cc276f9ae6
+ 2.7 en [eventdiscussionupdated,mod_forum]