Aggression argument for Zstd aggression

[Mark Kittisopikul]

The Zstd plugin accepts an aggression argument. However hdf5plugin.Zstd() takes no arguments.

This can be worked around by providing compression=hdf5plugin.ZSTD_ID, compression_opts=aggression to h5py.create_dataset.

hdf5plugin/src/HDF5Plugin-Zstandard/zstd_h5plugin.c

Line 35 in 505aad8

 aggression = (int)cd_values[0]; 

[Thomas VINCENT]

Indeed, that's missing!
Thanks for the report.

Pull request welcomed!

[Mark Kittisopikul]

I implemented the argument in #164