Impoved the software update function to enable the installation of apps like phpmyadmin into the apps vhost.

- added installation instructions for opensuse 11.2 with bind and dovecot
- fixed a bug in bind plugin.
- improved opensuse installer.

- Improved installer and updater for multiserver mode. Modules and plugins were only configured if the selected service is available on the server.

Moved server modules and plugins to new directory and updated the installer to create the symlinks for the modules and plugins from *-available to *-enabled directory.
Fixed a typo in mailfilter template.