Changes from 3.1.4 to 3.1.5

Fixes

• Fix decompression of all-zeros buffers whose length is not a multiple
  of typesize. read_chunk_header() previously rejected
  BLOSC2_SPECIAL_ZERO chunks whose nbytes was not a multiple of
  typesize. However, all-zeros decompression is just a memset and
  works regardless of element alignment, so the check was overly strict for
  this case (it remains valid for SPECIAL_NAN, SPECIAL_VALUE, and
  UNINIT, whose callers do enforce alignment). This affected, for
  example, python-blosc2's compress2 → decompress2 round-trip for
  all-zeros payloads such as bytes(707658) with typesize=8
  (707658 % 8 == 2). A regression test with 9 parametrized cases has
  been added. Closes Blosc/python-blosc2#665.

Notes

• This is a maintenance release with no API/ABI changes.