Wrong task speeds

[jvanakker]

For some reason some contest days analysis result in wrong task speeds for some some participants in the PySoar output.

For example:
https://www.soaringspot.com/en_gb/open-militaire-kampioenschappen-zweefvliegen-2019-terlet-2019/results/clubklasse/task-2-on-2019-06-06/daily
The E9 task speed is completely off, while the others all have correct values compared to the task speeds SoaringSpot.

Could be related to the other problem with incorrect distances? The problem here is that it's only for some (in this case just one) participant within the set of daily result IGC's.

[GliderGeek]

moved to here: GliderGeek/opensoar#37