Changes from 2.0.1 to 2.0.2

• Fixed data chunk memory leaks in frame (see #335).

• Fixed blosc2_stdio_open never returns NULL if it cannot open file.

• Standarized places for headers in blosc/ and include/ dirs.

• nthreads is int16_t everywhere in the API. Fixes #331.

• Add blosc2_remove_urlpath function (see #330).

• Fixed a bug when a lazy_chunk was created from a small, memcpyed chunk.
  (see #329).

• Fixed many issues in documentation (see #333).