Added a new module called "domain". With this module you can manage all domains (web + mail). Per default this module is not active. To activate it, you have to change the System Interface Config -> domains -> use the domain module. You also have to activate the domain-module for the admin (and for every client if you want). Important: you can not use this module if you have reseller!

- added server module for firewall and database.

- Changed shell of website linux user to /bin/false

- Fixed a bug were DNS SOA records could not be deleted.