Merge pull request #9025 from owncloud/fix-mail-settings

fix mail settings save function - ref #8854
skip certain tests for shipped apps
don't skip code check for skipped apps

those apps will have to use the public api
Merge pull request #8978 from owncloud/movie_preview_improvements

movie previews: use file directly when it's stored locally and encryption is not enabled
remove double space
[tx-robot] updated from transifex
Add server<->server sharing backend
add remote/add external shares to manager
Add coments to database and dont use sql keywords as table names
Add interface for accpeting external shares
Add interface for adding a public share to a different ownCloud instance
Fix exposing single files over webdav
Support path lengths up to 4000 chars
Fix removing remote shares
Dont return false for internalPath
Improve detection of whether we're in the files app
Scan the entire remote share at once by requesting the full file tree from the remote server
make sure to enable incognito mode when mounting a public link and update init status of the encryption app
exclude mounted server-to-server shares from encryption
Update for changes in master