add database-size monitoring. the results stored in the database may be used to add the db-size to the web-quota, too.

skip writing dkim-values for inactive domains
removed the public-dkim-key from the interface
added german language-file

- Added dkim installation to installer.
- Added backup filesize in backup cronjob.

- Implemented: FS#3110 - Turn monitoring module into cron jobs

http://www.howtoforge.com/forums/showthread.php?t=62691

Revision 4063 changed the command of apt-get dist-upgrade, so it is no longer neccessary to call as it is the same one that is already executed before and we can reuse the output.

Reverted SVN trunk back to revision 3938 to remove changes in default theme an a replacement of the ispconfig logo.

- Added backup size to web backups

 - added configuration options to server config (web tab, php section)
 - do not update custom php.inis if md5sum file does not exist