Changed defaults for unrecognized Ubuntu versions to 16.04 and for unrecognized Debian versions to Debian 9.

- added version cropping to installer

Removed ubuntu1604.lib.php which is not required anymore.

- Introduced confid in $distver array to separate the config and class for a distribution in the installer.
- Cleaned up the dist detection.

- Fixed a problem with restart of services due to the fact that Ubuntu has upstart and systemd installed, but only upstart is working without errors.

- Updated Linux Distribution detection to recognize all wheezy sub versions correctly.

- Added function to detect the apache version to installer.
- Added support for apache 2.4 to vhots templates for ispconfig vhost and apps vhost in installer.