Set parameter -c in mailbot command to switch the message encoding to UTF-8.

Disable mod_security for the ispconfig controlpanel vhost as mod_security produces false positive warnings.

Fixed: FS#1183 - remove server_id part from conditional stamenet in postfix and courier / dovecot queries.

Added alternative is_group detection function in system.inc.php. The new function is currently disabled.

Added better error handling to vlogger script in case that the mysql database connection is not available.