Fix undefined offset 1 for wrong user mail address

* fixes Undefined offset: 1 at lib/private/mail.php#143

Get rid of log warning when using servercontainer

Fix reshare permission change to not impair other deletion code

A recent change that prevents reshare permission changes to delete group
share children had the side-effect of also preventing group share
children deletion when it needed to be done.

This fix adds an extra flag to isolate the "reshare permission change"
deletion case and keep the other ones as they were before, not only to
fix the regression but also fix other potential regressions in code that
uses this method.

Also updated the comment because now Helper::delete() is no longer
limited to reshares but also applies to group share children.

Bypass the view when storing encryption keys

[ignore] delete all server-to-server shares if a user gets deleted

Make naming of encryption app consistent

Fixes https://github.com/owncloud/core/issues/13580

Remove duplicated slashes from the requested url

Do not clear fields until request return success in users admin page on user creation

add margin to log table - fixes #13558

show animated gifs on public sharing page

use title instead of name

External share dialog must properly read entered password

Set the debugoutput channel to error_log instead of echoing it

Fix webdav mkdir for remote shares

Unit tests are a must have for any changed code

Moved external share JS code into a small plugin to make it testable.

Added unit test for the external share dialog logic + ajax calls.

this must be larger then (>), since buggy behaviour occurs when the para...

avoid $this->cache being null 

Issue/13451 redis json encode

kill ancient code