Florian Pose <fp@igh-essen.com> [Fri, 03 Mar 2017 17:08:39 +0100] rev 2674
Clear unused ports; use arrows for next slaves.
Florian Pose <fp@igh-essen.com> [Fri, 03 Mar 2017 16:49:13 +0100] rev 2673
Optionally output CRC diagnosis information in graph.