[files_external] sftp tests

Include primary groups in user and login filter when restricting group access and also fix user counting in primary groups

Use flock instead of just checking if there is a file to prevent deadloc...

use flock instead of just checking if there is a file to prevent deadlocks when the process crashed or the unlink wasnt done

move cron.lock into top directory to prevent external storage issues

use tmp directory lock file

use new config interface

incorporate #13770

add dots

Activity manager performance improvements

3rd-party apps are disabled on upgrade

Fix code that never worked

Update group.php

Use "HTTPOnly" for cookies when logging out

Dont break code which relies on the cursor being open after insert/updat...

Introduced with https://github.com/owncloud/core/commit/1df8a5a774ae5d665849daf74540d967826d5e11 in February 2013…

add question about user-backend

Make the password changed msg inline to fix #10242

don't allow installation of already installed apps - fixes #14004

fix issue with previews not being displayed if filename contains apostrophe

Close the cursor after the affected count has been extracted.

Use `getParam` instead of `server`

Setup command

Make the search box filter apps

Update doctrine/dbal to 2.5.1 #13537

Fix Ajax type casting for files_external

Better caching for enabled apps

`server` is completely wrong here and this will not work on master. With `getParam` it will work fine though.

Testplan:
- [ ] Without patch: Share a file and try to access `http://localhost/public.php?service=files&t=THESHAREDTOKEN` => Fails
- [ ] With patch: Try the same => Works

Master only.

Fix some PHPDocs