fixed code styling (bit of a perfectionist) - Looks like someone accidentially removed an if clause here before and fixing killed styling.

...sorry...

It broke the installer

This reverts commit 07a7ae1f.

Conflicts:
	install/lib/installer_base.lib.php

removed check against web service for install state of panel (when config file is there, installer installed it which assures that webserver is installed and configured - or someone messed around)

Implementation of detection override to configure webserver wheenver the panel is installed on the host regardless of user's preference

updater: db-query working, requests working. This will be my MR and hopefully fixes ispconfig/ispconfig3#4163 and hopefully also fixes ispconfig/ispconfig3#4050

Improved ispconfig.vhost for apache so that the sethandler directive does not affect other software which is accessed trough aliases.

ISPConfig itself does not read nor interpret this header, but there might be other
server components like PHP that might interact with it so I'll disable it just to be sure.