[ENH] Triggering events for forum posts and comments

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@46924 b456876b-0849-0410-b77d-98878d47e9d5
[ENH] Sort event types in the activity stream admin panel

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@46925 b456876b-0849-0410-b77d-98878d47e9d5