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Forwarded request #1099794 from ateixeira

- Update to 0.15.9
    - ZstdFile class related changes:
      * Add SeekableZstdFile class, it's a subclass of ZstdFile, supports
      Zstandard Seekable Format.
      * Add mode argument to ZstdFile.flush() method, now it can flush
      a zstd frame.
      * Add read_size and write_size arguments to ZstdFile.__init__()
      method, can work with Network File Systems better.
      * Optimize ZstdFile performance to C language level.
  - Changes from 0.15.7
    - ZstdDict class changes:
      * Fix these advanced compression parameters may be ignored when
      loading a dictionary: windowLog, hashLog, chainLog, searchLog,
      minMatch, targetLength, strategy, enableLongDistanceMatching,
      ldmHashLog, ldmMinMatch, ldmBucketSizeLog, ldmHashRateLog,
      and some non-public parameters.
      * When compressing, load undigested dictionary instead of digested
      dictionary by default. Loading again an undigested is slower, see
      differences.
      * Add .as_prefix attribute. Can use zstd as a patching engine.

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required by py7zr update

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