* Fix issue #6847

Send a second message to remote recipients with conversation-author
as salmon author if the conversation-author is local.

The first dispatch will fail on old pods. New pods will ignore the
second message, if the guid already exist.

this creates inconsistent states, if you remove the block in the future

move it to Diaspora::Federation::Entities and use it in some tests, but most of the tests can be removed later.

closes #6817

There is no point to redirect to "/stream" after the account deletion
because the user is logged off.

* find returns nil if nothing found
* find! raises errors if not found or not visible

this is not used anymore:
* not logged in users are redirected to the login page
* logged in users see the normal 404 page

* move presenters back to controllers, this is view-logic
* use PostService in CommentService
* remove iframe route, this is not used anymore
* id/guid limit at 16 chars, hex(8) is 16 chars long

* move parameter normalization back to controller, because this is
  frontend-specific.
* if the StatusMessage is public, save also public photos

* use port for check
* respect entries in /etc/hosts
* test /.well-known/host-meta
* don't allow redirects to other domains

Only mark unread notifications as read otherwise, the UPDATE statement would update all the notifications...

closes #6711

closes #6710

Actually it redirects to stream page and says that user is already logged in.

Fix https://github.com/diaspora/diaspora/issues/6326

closes #6677

closes #6658

Fix typos

change forbitten to forbidden

fix styling issue and copypaste

improve code style for aspec_memberships_controller.rb with rubocop

fix styling issues

aligned elements of hash literals

fix typo

fix locale name and styling of its usage

fix failing tests

closes #6554

Minor merge conflict fix by theworldbright