Tracking/SkyLines: Updated server IP

SkyLines was moved to a bigger server and has a new IP now. Until we use
DNS lookup we have to update the IP manually.
Computer/CirclingComputer: Improve circling detection when using some external NMEA devices

Work around trac issues #3360 and #3372.

For position devices providing several position sources (in this case
GPS and Glonass) and sending the data via the same physical port a proper
solution would need to separate the individual streams to "virtual"
ports. This would allow proper prioritization fallback while also working
in the case that both streams actually send differing data (the device
where the problem occurred actually simply seems to mirror identical
data to different GPS and Glonass NMEA sentences).
Merge remote-tracking branches 'apf/v6.7.x' and 'turbo/skylines-ip' into v6.7.x