Created a more random temp path (where the first 'git clone' it's done).

No chown needed anymore.

A bit of refactoring.

Tabs

nginx: allow cgi execution under protected folder
nginx: allow protected folder under cgi-bin folder

Add new file to display current kernel info. Related to comment ispconfig/ispconfig3!789 (comment 63987)

Add description text for logging options.

Optimized prosody configuration for full conversations.im feature compartibility including full OMEMO support

Fixed#5019 LE cert problem in mirror setups. This patch disables the creation of Let's encrypt SSL certs on mirrored slave servers.

ispconfig/ispconfig3#5030

Added a third parameter to $app->log() function in server part to turn off logging to database and use this option in mysql lib to not log any server side SQL errors to the database.

- Fixed #5027 add support for PHP 7.1 and 7.2 on nginx servers in apps vhost.
- suppress some warnings in simplepie.inc.php

global option to enable pagespeed with nginx - allows to enable pagespeed even if no webserver-config is selected