[FIX] remove wrong required and readonly fields
[ADD] website_forum: quality badges
[ADD] website_forum: self_reply field and some badges
[ADD] website_forum: more badges
[FIX] website_forum: mooooore baaaaaadges
I love the smell of napalm in the morning.
One morning I shot an elephant in my pajamas. How he got in my pajamas, I don't know.
Allow overwrite of the serialising method to exclude some categories in the challenge search
[FIX] gamification: the subquery domain should use less than for ending dates
[IMP] gamification and website_forum improvements

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