Explicitly set height for #page-footer contents.

This should prevent anything below the footer, at least unless it wraps, which
should be prevented by the explicit font-size and width.

Fixes
https://trello.com/c/jlkmVAKo/168-bug-logo-in-der-leiste-abgeschnitten-chrome
wip merge/rebase from new_quest_types branch
Allow trusted userprofiles to have any avatar in the avatar directory.

We have to validate UserProfile->image ourselves in clean(), as it is dependent
on other values of the model, namely the trusted flag.
Don't overwrite the UserProfile->image field when getting ""

This fixes the bug which resets the user's avatar when editing the profile if it
is not one of the freely available ones.
fix schedule formatting for glitch
new frontpage article
Added der bote quest to arg page
show date/time of quests on board
show date/time of quests on board
switchable articles on homepage2 (last commit too)
wip
quest detail wip
articles3, anchors on frontpage
gemeinschaft instead of community
gefördert durch in neuem fenster öffnen
limit messages and notifications to 10, sent messages first, and hide read notifications
wip
some things work
Merge remote-tracking branch 'upstream/master' into new_quest_types_v2
fix tests