pep8
cleaner showmore template, js and css
add blockqoutes and showmore to formatting docs (fixes #404)
set Comment.variant.nullable=False
use Text.HEAD when variant is None in comments_sorted
Consistently use trailing slashes in empty elements

Port of hhucn/adhocracy.hhu_theme#440
fix: treat .alert and .info-box alike
fix typo
Update package database on first installation

This is a common stumbling block for junior developers, see hhucn/adhocracy.hhu_theme#438
load footer columns from staticpages if present
fix nested tabindex attribute
Merge pull request #517 from xi/feature-404-formatting

update formatting docs
Add missing %s substition string (fixes #530)
Fix user message link for relative_urls
Only propose to send user messages to current instance's members
Only send user messages to users with verified email addresses
Allow to send user messages from global user profile

This has previously only been allowed from within instance profiles for
no good reason.
Fix typo in German email notification template
Make configurable footer a configuration option
Fix staticpage logging statement