use AVERAGE overview resampling for better nodata handling #48
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This removes the large nodata regions from overviews. See descriptions of resampling methods at https://gdal.org/programs/gdaladdo.html#cmdoption-gdaladdo-r
hyp3lib.make_cogspreviously used-r averagewhen generating overviews as well.For reference, the list of all creation options for the COG driver are at https://gdal.org/drivers/raster/cog.html#creation-options