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Reduce CFA file size with small CFA variable HDF chunks #739

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@davidhassell

CFA netCDF variables can be very small, much smaller than a default HDF chunk size (= 1 MiB). when there are a lot of these, this can unnecessarily inflate the output CFA netCDF file size.

We could reset the HDF chunk size for these variables to be the variable shape. Even a very large aggregation has a relatively small CFA variables (by design!), so this shouldn't ever be a problem.

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