Changes from 2.9.3 to 2.10.0

bytedelta filter has been fixed. For backward compatibility, the old
bytedelta filter is still available as BLOSC_FILTER_BYTEDELTA_BUGGY
symbol, with the same ID (34) than before. The new, fixed bytedelta
filter has received a new ID (35) and it can be used via the usual
BLOSC_FILTER_BYTEDELTA symbol. That means that old data written with
the buggy bytedelta filter should be decompressed without issues.
Thanks to @FOODy (Tom Birch) for the fix. See #531, #532 for more info.
Filter buffers are correctly cycled now. Now it is possible to use e.g.
shuffle and bitshuffle filters in the pipeline. Thanks to @FOODy (Tom Birch)
for the fix. See #528 and PR #530.
Assorted fixes for allowing better inclusion in external projects.
Thanks to @ax3l (Axel Huebel). See #525, #527 and #529.
Minor fixes in the documentation. Thanks to @ivilata (Ivan Vilata).
See #523.

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