Corporation: use scopes for aktivitas and philisterschaft.
Structureable#move_to: do not move if parent and new parent are the same.
Vereinigungsgruppen für Amtsträger einrichten.

Trello: https://trello.com/c/oriKIGdx/693-amtstrager-struktur-ausbauen
Fixing officers patch by making Group#delete_cache_for_officers_group more efficient.

Trello: https://trello.com/c/oriKIGdx/693-amtstrager-struktur-ausbauen
introducing read-only mode.

This can be used to avoid maintenance mode when performing long
database operations that would lock the database.

Start this mode by touching the file `tmp/read_only_mode`, end it by
deleting the file.
read-only mode: allow console and rake task access.
improving rake patch:officers.

* bug fixing
* improved speed
* locales for the group names
group posts: adding new-post button in group contact boxes.

trello: https://trello.com/c/IJUGgYLL/690-rudimentare-sammel-nachrichten
improving group posts.

* authorization info
* feedback when message is sent
* simple feature spec
Event: allow child Pages.