add blosc2 code tree

src/blosc2/LICENSE.txt

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+BSD License
+
+For Blosc - A blocking, shuffling and lossless compression library
+
+Copyright (C) 2009-2018 Francesc Alted <francesc@blosc.org>
+Copyright (C) 2019- The Blosc Development Team <blosc@blosc.org>
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+ * Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer.
+
+ * Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+ * Neither the name Francesc Alted nor the names of its contributors may be used
+   to endorse or promote products derived from this software without specific
+   prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

src/blosc2/THANKS.rst

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+Thanks
+======
+
+* Valentin Haenel did a terrific work implementing the support for the Snappy compression, fixing typos and improving docs and the plotting script.
+
+* Thibault North, with ideas from Oscar Villellas, contributed a way to call Blosc from different threads in a safe way.  Christopher
+  Speller introduced contexts so that a global lock is not necessary anymore.
+
+* The CMake support was initially contributed by Thibault North, and Antonio Valentino and Mark Wiebe made great enhancements to it.
+
+* Christopher Speller also introduced the two new '_ctx' calls to avoid the use of the blosc_init() and blosc_destroy().
+
+* Jack Pappas contributed important portability enhancements, specially runtime and cross-platform detection of SSE2/AVX2 as well as high precision timers (HPET) for the benchmark program.
+
+* @littlezhou implemented the AVX2 version of shuffle routines.
+
+* Julian Taylor contributed a way to detect AVX2 in runtime and calling the appropriate routines only if the underlying hardware supports it.
+
+* Lucian Marc provided the support for ARM/NEON for the shuffle filter.
+
+* Jerome Kieffer contributed support for PowerPC/ALTIVEC for the shuffle/bitshuffle filter.
+
+* Alberto Sabater, for his great efforts on producing really nice Blosc2 docs, among other aspects.
+
+* Kiyo Masui for relicensing his bitshuffle project for allowing the inclusion of part of his code in Blosc.
+
+* Aleix Alcacer for his implementation of mutable super-chunks, multiple variable length metalayers and many other things.
+
+* Oscar Guiñón for the optimization of reading a (sparse) set of blocks of a chunk in parallel.
+
+* Nathan Moinvaziri for his outstanding work on the security side of the things via `fuzzer testing <https://google.github.io/oss-fuzz/>`_.
+
+* Marta Iborra for her implementation of sparse storage for persistent super-chunks.