Added first stage of public avatars

Prev people who weren't friends would only see 'Anon' as posting a
message, whereas as now all names and avatars are public. Next step is a
'follow / add' button if the people aren't friends, this will hopefully
drive engagement and increase people adding each other as friends.

Speaking of which, there was some bad code leftover from a prev
revision, so one could add oneself as a friend, which is kind of lame,
now prevented.

Not a bad session.