Added missing strings from english language files to german language files. TODO: Translate missing strings

- Updated Debian installation instructions.

- Better Autoresponder script
- Fixed error in language file.

- fixed bugs when websites and dns zones were deleted.

- Added dutch translation (many thanks to Hans!)

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

Fixed: Several php notices for undefined indexes.

Added a server module for clients and a mail plugin.

- added a daily cronjob for stats creation in the installer.
- Fixed a bug in the spamfilter white / blacklist forms (thanks to satommy for reporting this)
- fixed ssl cert path in vhost templates/web_domain_ssl.htm
- fixed a bug in the apache plugin which prevented the copying of the standard error and index files.

- Fixed several bugs.

2.) Cleaned up update.php
3.) Changed definitions for quarantine settings
4.) Commented out areas for quarantining 'clean' and 'other'