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

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

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

- Fixed: FS#3710 - Bug with PHP-FPM configuration since 3.0.5.4 Patch 4
- Fixed wrong function calls in system lib.

- Create md5 sums of all files at install and update.

- Added some cleanup code

- Added autoinstall for centos, opensuse and gentoo
- Added ini style config autoinstall option
- Autoinstall sample configuration files are now in docs folder
- Removed old autoupdate file

* i don't have mailman installed, but update.php tried to configure it
* i also fixed the check for doveadm in suse & fedora lib, but it seems my centos dovecot does not have "doveadm mount" subcommand, so i think the doveadm error will still exist
* on centos the 'receive_override_options = no_address_mappings' was added to postfix main.cf which leads to not working e-mail aliases/forwards

Reconfigure Services? (yes,no) [yes]: /ispconfig/ispconfig3/tree/master/

Configuring Postfix postalias: fatal: open /var/lib/mailman/data/aliases: No such file or directory Configuring Mailman
PHP Warning: chgrp(): Unable to find gid for mailman in /usr/src/ispconfig3_install/install/dist/lib/fedora.lib.php on line 106 Configuring Jailkit
Configuring Dovecot
usage: doveadm [-Dv] [-f ] []

altmove [-u |-A] [-S ]
auth [-a ] [-x ] []
config [doveconf parameters]
director add|flush|map|remove|status
dump [-t ]
expunge [-u |-A] [-S ]
fetch [-u |-A] [-S ]
force-resync [-u |-A] [-S ]
help
import [-u |-A] [-S ]
kick [-a ] [-f] [|]
log find|reopen|test
mailbox create|delete|list|mutf7|rename|status|subscribe|unsubscribe
penalty [-a ] []
purge [-u |-A] [-S ]
pw [-l] [-p plaintext] [-r rounds] [-s scheme] [-u user] [-V]
reload
search [-u |-A] [-S ]
sis deduplicate|find
stop
user [-a ] [-x ] [...]
who [-a ] [-1] [] []
Configuring Spamassassin
Configuring Getmail
Configuring Database

- 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.

configure_amavis() adds some extra lines to postfix's main.cf & master.cf
which are not required and are leading to malfunction when amavis is not installed.