Merge pull request #13101 from owncloud/variable-is-undefined-please-use-a-proper-ide-in-the-future-whoever-did-that

Fix undefined variable and write unit tests for OC_Principal connector

escape . in htaccess regex for CSS and JS HTTP headers

Check for version before mounting a public link

Use info instead of warning log level

* ownCloud 7.0.0 is needed - version of merge of server <-> server
  sharing - https://github.com/owncloud/core/pull/8399
* adjust error message

Otherwise the log is flooded as can be seen at https://github.com/owncloud/core/issues/13106

Fixes https://github.com/owncloud/core/issues/13106

Remove unnecessary setUp method from provisioning_api

fix "app":"PHP","message":"Undefined variable: user at/principal.php#66"

changed variable #user to #name

Fix: X-Accel-Redirect did not support custom data dir and local mounts

Fix remaining unit tests for provisioning_api

adopt text "no external storage configured"

Add provisioning_api app.php so app is detected

storage -> storages

Don´t open the champaign yet. This is obviously not the final release. ;-)
The final will have the version number 8.0.0.x

update dbal to 2.5.0