place/threads: better _notify msgs & error handling, improved html & json generation, TODO: use signatures here as well
place/userthreads: added /add, /remove & /privacy cmds
person: (un)subscribe to user channel when a user uses the /add & /remove commands, autojoin to #friends & #follow after friendship is established, added _channels data to qDescription
user: htDescription: generate html from _channels data
http: TODO: fix web examine cmd so it's not executed twice
- allow arbitrary user channels to be subscribed, e.g. #follow or #friends, /sub ~user defaults to #follow
- friends & /invite'd strangers are allowed to join
