fixes #8001

closes #8003

fixes #7808

closes #7913

closes #7912

closes #7826

closes #7772

Fixes #6564.

closes #7775

closes #7769

This feature only worked on the same pod and was more confusing than
useful.

I overlooked this when reviewing #6418 since it is excluded on travis
because of the @nophantomjs tag (so it didn't fail). But since we block
http:// embeds now, we need to use https:// for the tests.

Use this tag for tests which can't work with PhantomJS, but which we
can run with Selenium using some other profile (not implemented here).

closes #6418

Use markdown-it-html5-embed plugin so user can embed audio and
video using the markdown link syntax []() in the HTML5 way.

closes #7690

This is an internal active record table and shouldn't be touched. When
this is truncated you need to fix it again by running
`bin/rails db:environment:set RAILS_ENV=test`

This is a temporary fix until there is a new version of
database_cleaner.

closes #7606

closes #7605

closes #7601

closes #7600

The user_email is the first field anyway, and login form as a
user_username field too, so it maybe happens that we already fill in the
user_username filed there before page load finished.

closes #7556

closes #7530

closes #7554

closes #7548

closes #7543