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Fix zero windspeed on zero meridian

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@SanderHulst SanderHulst released this 12 Aug 08:54
· 14 commits to release-dtn/6.07 since this release

The averaging code in WAVEWATCH was not properly projecting 0.125 degree ECMWF surface wind data on the global 30 minute grid, while 0.25 degree GFS data appeared to be projected to the target grid just fine.

A bug was present that affected both datasources but only resulted in the zero windspeed in the ECMWF case because of threshold in the same averaging code.