[MOD] Extracting the recent notifications to a separate action, introduce summary format for activities

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@49767 b456876b-0849-0410-b77d-98878d47e9d5
[ENH] Disable comments on forum activities (join the discussion instead of commenting on it, add a switch on activityframe to select how to handle comments

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@49769 b456876b-0849-0410-b77d-98878d47e9d5
[ENH] Link to extended activity

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@49770 b456876b-0849-0410-b77d-98878d47e9d5