[PATCH] Ignore heading event

[Krzysztof Arentowicz]

Address #586 by disabling drawing a dive flag pixmap for heading events.

I think the best way to visualize heading information is to add a
separate graph similar to wind direction in this weather forecast:
http://www.meteo.pl/index_en.php
but this is beyond my ability.

Thanks,
Krzysiek
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