shows warning for missing services during install (and allows force-configure for missing / not detected services)

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

- 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.

  - This makes ufw the default if it's found

Fixed: FS#2378 - $conf['theme'] value in interface/lib/config.inc.php is overwritten (reset to 'default') on update