fmask overviews are different from the rest of bands

[Kirill888]

fmask has overview for levels 4, 8, 16, 32, 64, 127 while other bands have 2, 4, 8, 16, 32

[sixy6e]

The pythonfmask code creates an ERDAS Image file, which is similar to JPEG 2000, and contains internal overviews. The code simply translates the file to GDAL and preserves much of everything generated by the HFA driver.

Anyway, the workflow and packaging repo has it earmarked for removal anyway.