Release v0.11.5 (obsolete hotfix)

The bobsolete hotfix release for a flaw of Linux unified page/buffer cache.
See issue#269 for more information.

Acknowledgements:

• Simon Leier for reporting and testing.
• Kai Wetlesen for RPMs.
• Tullio Canepa for reporting C++ API issue and contributing.

Fixes:

• Added workaround for a flaw of Linux 4.19 (at least) unified page/buffer cache.
• Fixed/Reworked move-assignment operators for "managed" classes of C++ API.
• Fixed potential SIGSEGV while open DB with overrided non-default page size.
• Made mdbx_env_open() idempotence in failure cases.
• Refined/Fixed pages reservation inside mdbx_update_gc() to avoid non-reclamation in a rare cases.
• Fixed typo in a retained space calculation for the hsr-callback.

Minors:

• Reworked functions for meta-pages, split-off non-volatile.
• Disentangled C11-atomic fences/barriers and pure-functions (with __attribute__((__pure__))) to avoid compiler misoptimization.
• Fixed hypotetic unaligned access to 64-bit dwords on ARM with __ARM_FEATURE_UNALIGNED defined.
• Reasonable paranoia that makes clarity for code readers.
• Minor fixes Doxygen references, comments, descriptions, etc.

Please refer to the ChangeLog for more historical information and actual TODOs.

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SHA256 checksums

d6f42ed3d910046eb1df8a6dc1e7959d59a409c1d0d7250837a843e2b5f43bd2  libmdbx-amalgamated-0.11.5.tar.gz
88ba43a888f45718d6fc7f8b529ec9bcd40726d54feae8fa5e5892516f2acfb1  libmdbx-amalgamated-0_11_5.zip

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