Change order of "proposals" and "norms" in subnavigation

Previously, norms came before proposals. This is now reversed, as in
practice, proposals are used more prominently.
i18n: updated German translation

Above all: Change "Themen" to "Beschlüsse"
Per-instance configuration for editable comments default (fixes #140)

This commit allows to configure on a per-instance base, whether commits
are by default editable by others, or not.

Note: Requires schema update.
Merge pull request #141 from liqd/feature/140-editable-comments-default

Per-instance configuration for editable comments default (fixes #140)
i18n: updated German translation
Added action to administration page, to manually update solr index.
Model/controller changes for invisible badges
Template changes for invisible badges
JavaScript changes for invisible badges
Improve badge preview
Bump FormEncode to 1.2.5
Since they haven't released for nearly two years (despite fixing the bugs), use a temporary replacement package.
Revert "Bump FormEncode to 1.2.5"
It turns out there are a number of other dependencies to consider; it only worked by accident, and only on my machine(TM).

This reverts commit 995f191be44041d533cee340428775698bc58efc.
Correct pager/sort URL generation
Fix robots.txt after base_url change

Addendum to ad4c95357faeea8c96f28346fbde2f808162c290
Update spectrum.js to 1.0.2
Allow explicit entry of color code in color picker (fixes #148)
Default to path='/' in base_url

The `base_url` function now assumes '/' as the default path. Instead of
setting '/' as default parameter, it is only added if there's no domain
part, as adhocracy defaults to URLs without trailing slash.

This fixes #146.
Remove superfluous template element
Move instance setting to logo row

Fixes #145
Avoid SQLAlchemy warnings regarding superfluous database calls

Don't do in_([]) queries.

This avoids the following SQLAlchemy warning:

> SAWarning: The IN-predicate on "xxx" was invoked with an empty
sequence. This results in a contradiction, which nonetheless can be
expensive to evaluate.  Consider alternative strategies for improved
performance.