gamification: - fix batch mode when grouping by id - fix subquery in batch mode when a ending date is set - serialisation method can exclude categories of challenge - view improvements website_forum: - enabling bages in batch mode - fix karma computation when creating a new post - changing previous vote affects the user karma - do not display forum challenges on user home page bzr revid: mat@openerp.com-20140415162400-78cklbdw0bmn94zr