XCSoar/python/test/test_xcsoar.py should probably be updated to Python 3

[scls19fr]

Hello,

I don't know exactly what is the purpose of https://github.com/XCSoar/XCSoar/blob/master/python/test/test_xcsoar.py
But it should probably be updated to Python 3

Pinging @TobiasLohner

Kind regards

[scls19fr]

This file should probably also be renamed because test_...py are often used as filename for unit tests (automatically detected by tools such as nosetests or pytest

[roscosoarer]

If this is associated with the SkyEcho interface I am interested. SkyEcho outputs Garmin format GLD-90 (ADSB protocol)) that needs to be converted into NMEA messages I currently do this by running XC-Guide and WiFi that into my Samsung table through < devices> localhost but this is clunky and unreliable and often requires XCSoar to be restarted [=bad in-flight log]. A simpler interface would be great. I'm watching with interest.

[lordfolken]

implemented by f5a478f