The stable release with the complete workaround for an incoherence flaw of Linux unified page/buffer cache.
Nonetheless the cause for this trouble may be an issue of Intel CPU cache/MESI.
See [issue#269](https://github.com/erthink/libmdbx/issues/269) for more information.

Acknowledgements:
-----------------

 - [David Bouyssié](https://github.com/david-bouyssie) for [Scala bindings](https://github.com/david-bouyssie/mdbx4s).
 - [Michelangelo Riccobene](https://github.com/mriccobene) for reporting and testing.

Fixes:
------

 - [Added complete workaround](https://github.com/erthink/libmdbx/issues/269) for an incoherence flaw of Linux unified page/buffer cache.
 - [Fixed](https://github.com/erthink/libmdbx/issues/272) cursor reusing for read-only transactions.
 - Fixed copy&paste typo inside `mdbx::cursor::find_multivalue()`.

Minors:
-------

 - Minor refine C++ API for convenience.
 - Minor internals refines.
 - Added `lib-static` and `lib-shared` targets for make.
 - Added minor workaround for AppleClang 13.3 bug.
 - Clarified error messages of a signature/version mismatch.

Signed-off-by: Леонид Юрьев (Leonid Yuriev) <leo@yuriev.ru>

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