If the firewall is part of a local network (e.g. GREEN),
we automatically add rules that grant/forbid access for the firewall,
too.
This has been broken for various default policies other than ALLOWED.
Now:
When using a hostgroup as source there are all corresponding DNAT
interfaces shown in ruletable depending on the entries in the group.
When in DNAT area "-automatic" is selected, the DNAT interfaces are
shown as IP-Addresses, else they are shown as "ORANGE","GREEN","BLUE"...
BUGFIX: When there is a MAC address used in a sourcegroup, the rules could not be set. Now MAC addresses get allways the public interface as DNAT
