also for #2771 - removal of all MDBX utilities and libmdbx.mir itself

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diff --git a/libs/libmdbx/src/ChangeLog.md b/libs/libmdbx/src/ChangeLog.md
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-ChangeLog
----------
-
-## v0.9.3 (in development) scheduled at 2021-02-23
-
-TODO:
- - Engage new terminology (https://github.com/erthink/libmdbx/issues/137).
- - Rework/speedup the implementation of the dirty page list (lazy compactification, lazy sorting via merge).
- - Resolve few TODOs (https://github.com/erthink/libmdbx/issues/124, https://github.com/erthink/libmdbx/issues/127,
-   https://github.com/erthink/libmdbx/issues/132, https://github.com/erthink/libmdbx/issues/115).
- - Finalize C++ API (few typos and trivia bugs are still likely for now).
- - Packages for [ROSA Linux](https://www.rosalinux.ru/), [ALT Linux](https://www.altlinux.org/), Fedora/RHEL, Debian/Ubuntu.
-
-Acknowledgements:
-
- - [Mahlon E. Smith](http://www.martini.nu/) for [FreeBSD port of libmdbx](https://svnweb.freebsd.org/ports/head/databases/mdbx/).
- - [장세연](http://www.castis.com) for bug fixing and PR.
- - [Clément Renault](https://github.com/Kerollmops/heed) for [Heed](https://github.com/Kerollmops/heed) fully typed Rust wrapper.
- - [Alex Sharov](https://github.com/AskAlexSharov) for bug reporting.
- - [Noel Kuntze](https://github.com/Thermi) for bug reporting.
-
-Removed options and features:
-
- - Drop `MDBX_HUGE_TRANSACTIONS` build-option (now no longer required).
-
-New features:
-
- - Package for FreeBSD is available now by Mahlon E. Smith.
- - New API functions to get/set various options (https://github.com/erthink/libmdbx/issues/128):
-    - the maximum number of named databases for the environment;
-    - the maximum number of threads/reader slots;
-    - threshold (since the last unsteady commit) to force flush the data buffers to disk;
-    - relative period (since the last unsteady commit) to force flush the data buffers to disk;
-    - limit to grow a list of reclaimed/recycled page's numbers for finding a sequence of contiguous pages for large data items;
-    - limit to grow a cache of dirty pages for reuse in the current transaction;
-    - limit of a pre-allocated memory items for dirty pages;
-    - limit of dirty pages for a write transaction;
-    - initial allocation size for dirty pages list of a write transaction;
-    - maximal part of the dirty pages may be spilled when necessary;
-    - minimal part of the dirty pages should be spilled when necessary;
-    - how much of the parent transaction dirty pages will be spilled while start each child transaction;
- - Unlimited/Dynamic size of retired and dirty page lists (https://github.com/erthink/libmdbx/issues/123).
- - Added `-p` option (purge subDB before loading) to `mdbx_load` tool.
- - Reworked spilling of large transaction and committing of nested transactions:
-    - page spilling code reworked to avoid the flaws and bugs inherited from LMDB;
-    - limit for number of dirty pages now is controllable at runtime;
-    - a spilled pages, including overflow/large pages, now can be reused and refunded/compactified in nested transactions;
-    - more effective refunding/compactification especially for the loosed page cache.
- - Added `MDBX_ENABLE_REFUND` and `MDBX_PNL_ASCENDING` internal/advanced build options.
- - Added `mdbx_default_pagesize()` function.
- - Better support architectures with a weak/relaxed memory consistency model (ARM, AARCH64, PPC, MIPS, RISC-V, etc) by means [C11 atomics](https://en.cppreference.com/w/c/atomic).
-
-Fixes:
-
- - Fixed missing cleanup (null assigned) in the C++ commit/abort (https://github.com/erthink/libmdbx/pull/143).
- - Fixed `mdbx_realloc()` for case of nullptr and `MDBX_AVOID_CRT=ON` for Windows.
- - Fixed the possibility to use invalid and renewed (closed & re-opened, dropped & re-created) DBI-handles (https://github.com/erthink/libmdbx/issues/146).
- - Fixed 4-byte aligned access to 64-bit integers, including access to the `bootid` meta-page's field (https://github.com/erthink/libmdbx/issues/153).
- - Fixed minor/potential memory leak during page flushing and unspilling.
- - Fixed handling states of cursors's and subDBs's for nested transactions.
- - Fixed page leak in extra rare case the list of retired pages changed during update GC on transaction commit.
- - Fixed assertions to avoid false-positive UB detection by CLANG/LLVM (https://github.com/erthink/libmdbx/issues/153).
- - Fixed `MDBX_TXN_FULL` and regressive `MDBX_KEYEXIST` during large transaction commit with `MDBX_LIFORECLAIM` (https://github.com/erthink/libmdbx/issues/123).
- - Fixed auto-recovery (`weak->steady` with the same boot-id) when Database size at last weak checkpoint is large than at last steady checkpoint.
- - Fixed operation on systems with unusual small/large page size, including PowerPC (https://github.com/erthink/libmdbx/issues/157).
-
-
-## v0.9.2 at 2020-11-27
-
-Acknowledgements:
-
- - Jens Alfke (Mobile Architect at [Couchbase](https://www.couchbase.com/)) for [NimDBX](https://github.com/snej/nimdbx).
- - Clément Renault (CTO at [MeiliSearch](https://www.meilisearch.com/)) for [mdbx-rs](https://github.com/Kerollmops/mdbx-rs).
- - Alex Sharov (Go-Lang Teach Lead at [TurboGeth/Ethereum](https://ethereum.org/)) for an extreme test cases and bug reporting.
- - George Hazan (CTO at [Miranda NG](https://www.miranda-ng.org/)) for bug reporting.
- - [Positive Technologies](https://www.ptsecurity.com/) for funding and [The Standoff](https://standoff365.com/).
-
-Added features:
-
- - Provided package for [buildroot](https://buildroot.org/).
- - Binding for Nim is [available](https://github.com/snej/nimdbx) now by Jens Alfke.
- - Added `mdbx_env_delete()` for deletion an environment files in a proper and multiprocess-safe way.
- - Added `mdbx_txn_commit_ex()` with collecting latency information.
- - Fast completion pure nested transactions.
- - Added `LIBMDBX_INLINE_API` macro and inline versions of some API functions.
- - Added `mdbx_cursor_copy()` function.
- - Extended tests for checking cursor tracking.
- - Added `MDBX_SET_LOWERBOUND` operation for `mdbx_cursor_get()`.
-
-Fixes:
-
- - Fixed missing installation of `mdbx.h++`.
- - Fixed use of obsolete `__noreturn`.
- - Fixed use of `yield` instruction on ARM if unsupported.
- - Added pthread workaround for buggy toolchain/cmake/buildroot.
- - Fixed use of `pthread_yield()` for non-GLIBC.
- - Fixed use of `RegGetValueA()` on Windows 2000/XP.
- - Fixed use of `GetTickCount64()` on Windows 2000/XP.
- - Fixed opening DB on a network shares (in the exclusive mode).
- - Fixed copy&paste typos.
- - Fixed minor false-positive GCC warning.
- - Added workaround for broken `DEFINE_ENUM_FLAG_OPERATORS` from Windows SDK.
- - Fixed cursor state after multimap/dupsort repeated deletes (https://github.com/erthink/libmdbx/issues/121).
- - Added `SIGPIPE` suppression for internal thread during `mdbx_env_copy()`.
- - Fixed extra-rare `MDBX_KEY_EXIST` error during `mdbx_commit()` (https://github.com/erthink/libmdbx/issues/131).
- - Fixed spilled pages checking (https://github.com/erthink/libmdbx/issues/126).
- - Fixed `mdbx_load` for 'plain text' and without `-s name` cases (https://github.com/erthink/libmdbx/issues/136).
- - Fixed save/restore/commit of cursors for nested transactions.
- - Fixed cursors state in rare/special cases (move next beyond end-of-data, after deletion and so on).
- - Added workaround for MSVC 19.28 (Visual Studio 16.8) (but may still hang during compilation).
- - Fixed paranoidal Clang C++ UB for bitwise operations with flags defined by enums.
- - Fixed large pages checking (for compatibility and to avoid false-positive errors from `mdbx_chk`).
- - Added workaround for Wine (https://github.com/miranda-ng/miranda-ng/issues/1209).
- - Fixed `ERROR_NOT_SUPPORTED` while opening DB by UNC pathnames (https://github.com/miranda-ng/miranda-ng/issues/2627).
- - Added handling `EXCEPTION_POSSIBLE_DEADLOCK` condition for Windows.
-
-
-## v0.9.1 2020-09-30
-
-Added features:
-
- - Preliminary C++ API with support for C++17 polymorphic allocators.
- - [Online C++ API reference](https://erthink.github.io/libmdbx/) by Doxygen.
- - Quick reference for Insert/Update/Delete operations.
- - Explicit `MDBX_SYNC_DURABLE` to sync modes for API clarity.
- - Explicit `MDBX_ALLDUPS` and `MDBX_UPSERT` for API clarity.
- - Support for read transactions preparation (`MDBX_TXN_RDONLY_PREPARE` flag).
- - Support for cursor preparation/(pre)allocation and reusing (`mdbx_cursor_create()` and `mdbx_cursor_bind()` functions).
- - Support for checking database using specified meta-page (see `mdbx_chk -h`).
- - Support for turn to the specific meta-page after checking (see `mdbx_chk -h`).
- - Support for explicit reader threads (de)registration.
- - The `mdbx_txn_break()` function to explicitly mark a transaction as broken.
- - Improved handling of corrupted databases by `mdbx_chk` utility and `mdbx_walk_tree()` function.
- - Improved DB corruption detection by checking parent-page-txnid.
- - Improved opening large DB (> 4Gb) from 32-bit code.
- - Provided `pure-function` and `const-function` attributes to C API.
- - Support for user-settable context for transactions & cursors.
- - Revised API and documentation related to Handle-Slow-Readers callback feature.
-
-Deprecated functions and flags:
-
- - For clarity and API simplification the `MDBX_MAPASYNC` flag is deprecated.
-   Just use `MDBX_SAFE_NOSYNC` or `MDBX_UTTERLY_NOSYNC` instead of it.
- - `MDBX_oom_func`, `mdbx_env_set_oomfunc()` and `mdbx_env_get_oomfunc()`
-   replaced with `MDBX_hsr_func`, `mdbx_env_get_hsr` and `mdbx_env_get_hsr()`.
-
-Fixes:
-
- - Fix `mdbx_strerror()` for `MDBX_BUSY` error (no error description is returned).
- - Fix update internal meta-geo information in read-only mode (`EACCESS` or `EBADFD` error).
- - Fix `mdbx_page_get()` null-defer when DB corrupted (crash by `SIGSEGV`).
- - Fix `mdbx_env_open()` for re-opening after non-fatal errors (`mdbx_chk` unexpected failures).
- - Workaround for MSVC 19.27 `static_assert()` bug.
- - Doxygen descriptions and refinement.
- - Update Valgrind's suppressions.
- - Workaround to avoid infinite loop of 'nested' testcase on MIPS under QEMU.
- - Fix a lot of typos & spelling (Thanks to Josh Soref for PR).
- - Fix `getopt()` messages for Windows (Thanks to Andrey Sporaw for reporting).
- - Fix MSVC compiler version requirements (Thanks to Andrey Sporaw for reporting).
- - Workarounds for QEMU's bugs to run tests for cross-builded library under QEMU.
- - Now C++ compiler optional for building by CMake.
-
-
-## v0.9.0 2020-07-31 (not a release, but API changes)
-
-Added features:
-
- - [Online C API reference](https://erthink.github.io/libmdbx/) by Doxygen.
- - Separated enums for environment, sub-databases, transactions, copying and data-update flags.
-
-Deprecated functions and flags:
-
- - Usage of custom comparators and the `mdbx_dbi_open_ex()` are deprecated, since such databases couldn't be checked by the `mdbx_chk` utility.
-   Please use the value-to-key functions to provide keys that are compatible with the built-in libmdbx comparators.
-
-
-## v0.8.2 2020-07-06
-- Added support multi-opening the same DB in a process with SysV locking (BSD).
-- Fixed warnings & minors for LCC compiler (E2K).
-- Enabled to simultaneously open the same database from processes with and without the `MDBX_WRITEMAP` option.
-- Added key-to-value, `mdbx_get_keycmp()` and `mdbx_get_datacmp()` functions (helpful to avoid using custom comparators).
-- Added `ENABLE_UBSAN` CMake option to enabling the UndefinedBehaviorSanitizer from GCC/CLANG.
-- Workaround for [CLANG bug](https://bugs.llvm.org/show_bug.cgi?id=43275).
-- Returning `MDBX_CORRUPTED` in case all meta-pages are weak and no other error.
-- Refined mode bits while auto-creating LCK-file.
-- Avoids unnecessary database file re-mapping in case geometry changed by another process(es).
-  From the user's point of view, the `MDBX_UNABLE_EXTEND_MAPSIZE` error will now be returned less frequently and only when using the DB in the current process really requires it to be reopened.
-- Remapping on-the-fly and of the database file was implemented.
-  Now remapping with a change of address is performed automatically if there are no dependent readers in the current process.
-
-
-## v0.8.1 2020-06-12
-- Minor change versioning. The last number in the version now means the number of commits since last release/tag.
-- Provide ChangeLog file.
-- Fix for using libmdbx as a C-only sub-project with CMake.
-- Fix `mdbx_env_set_geometry()` for case it is called from an opened environment outside of a write transaction.
-- Add support for huge transactions and `MDBX_HUGE_TRANSACTIONS` build-option (default `OFF`).
-- Refine LTO (link time optimization) for clang.
-- Force enabling exceptions handling for MSVC (`/EHsc` option).
-
-
-## v0.8.0 2020-06-05
-- Support for Android/Bionic.
-- Support for iOS.
-- Auto-handling `MDBX_NOSUBDIR` while opening for any existing database.
-- Engage github-actions to make release-assets.
-- Clarify API description.
-- Extended keygen-cases in stochastic test.
-- Fix fetching of first/lower key from LEAF2-page during page merge.
-- Fix missing comma in array of error messages.
-- Fix div-by-zero while copy-with-compaction for non-resizable environments.
-- Fixes & enhancements for custom-comparators.
-- Fix `MDBX_AVOID_CRT` option and missing `ntdll.def`.
-- Fix `mdbx_env_close()` to work correctly called concurrently from several threads.
-- Fix null-deref in an ASAN-enabled builds while opening the environment with error and/or read-only.
-- Fix AddressSanitizer errors after closing the environment.
-- Fix/workaround to avoid GCC 10.x pedantic warnings.
-- Fix using `ENODATA` for FreeBSD.
-- Avoid invalidation of DBI-handle(s) when it just closes.
-- Avoid using `pwritev()` for single-writes (up to 10% speedup for some kernels & scenarios).
-- Avoiding `MDBX_UTTERLY_NOSYNC` as result of flags merge.
-- Add `mdbx_dbi_dupsort_depthmask()` function.
-- Add `MDBX_CP_FORCE_RESIZEABLE` option.
-- Add deprecated `MDBX_MAP_RESIZED` for compatibility.
-- Add `MDBX_BUILD_TOOLS` option (default `ON`).
-- Refine `mdbx_dbi_open_ex()` to safe concurrently opening the same handle from different threads.
-- Truncate clk-file during environment closing. So a zero-length lck-file indicates that the environment was closed properly.
-- Refine `mdbx_update_gc()` for huge transactions with small sizes of database page.
-- Extends dump/load to support all MDBX attributes.
-- Avoid upsertion the same key-value data, fix related assertions.
-- Rework min/max length checking for keys & values.
-- Checking the order of keys on all pages during checking.
-- Support `CFLAGS_EXTRA` make-option for convenience.
-- Preserve the last txnid while copying with compactification.
-- Auto-reset running transaction in mdbx_txn_renew().
-- Automatically abort errored transaction in mdbx_txn_commit().
-- Auto-choose page size for large databases.
-- Rearrange source files, rework build, options-support by CMake.
-- Crutch for WSL1 (Windows subsystem for Linux).
-- Refine install/uninstall targets.
-- Support for Valgrind 3.14 and later.
-- Add check-analyzer check-ubsan check-asan check-leak targets to Makefile.
-- Minor fix/workaround to avoid UBSAN traps for `memcpy(ptr, NULL, 0)`.
-- Avoid some GCC-analyzer false-positive warnings.
-
-
-## v0.7.0 2020-03-18
-- Workarounds for Wine (Windows compatibility layer for Linux).
-- `MDBX_MAP_RESIZED` renamed to `MDBX_UNABLE_EXTEND_MAPSIZE`.
-- Clarify API description, fix typos.
-- Speedup runtime checks in debug/checked builds.
-- Added checking for read/write transactions overlapping for the same thread, added `MDBX_TXN_OVERLAPPING` error and `MDBX_DBG_LEGACY_OVERLAP` option.
-- Added `mdbx_key_from_jsonInteger()`, `mdbx_key_from_double()`, `mdbx_key_from_float()`, `mdbx_key_from_int64()` and `mdbx_key_from_int32()` functions. See `mdbx.h` for description.
-- Fix compatibility (use zero for invalid DBI).
-- Refine/clarify error messages.
-- Avoids extra error messages "bad txn" from mdbx_chk when DB is corrupted.
-
-
-## v0.6.0 2020-01-21
-- Fix `mdbx_load` utility for custom comparators.
-- Fix checks related to `MDBX_APPEND` flag inside `mdbx_cursor_put()`.
-- Refine/fix dbi_bind() internals.
-- Refine/fix handling `STATUS_CONFLICTING_ADDRESSES`.
-- Rework `MDBX_DBG_DUMP` option to avoid disk I/O performance degradation.
-- Add built-in help to test tool.
-- Fix `mdbx_env_set_geometry()` for large page size.
-- Fix env_set_geometry() for large pagesize.
-- Clarify API description & comments, fix typos.
-
-
-## v0.5.0 2019-12-31
-- Fix returning MDBX_RESULT_TRUE from page_alloc().
-- Fix false-positive ASAN issue.
-- Fix assertion for `MDBX_NOTLS` option.
-- Rework `MADV_DONTNEED` threshold.
-- Fix `mdbx_chk` utility for don't checking some numbers if walking on the B-tree was disabled.
-- Use page's mp_txnid for basic integrity checking.
-- Add `MDBX_FORCE_ASSERTIONS` built-time option.
-- Rework `MDBX_DBG_DUMP` to avoid performance degradation.
-- Rename `MDBX_NOSYNC` to `MDBX_SAFE_NOSYNC` for clarity.
-- Interpret `ERROR_ACCESS_DENIED` from `OpenProcess()` as 'process exists'.
-- Avoid using `FILE_FLAG_NO_BUFFERING` for compatibility with small database pages.
-- Added install section for CMake.
-
-
-## v0.4.0 2019-12-02
-- Support for Mac OSX, FreeBSD, NetBSD, OpenBSD, DragonFly BSD, OpenSolaris, OpenIndiana (AIX and HP-UX pending).
-- Use bootid for decisions of rollback.
-- Counting retired pages and extended transaction info.
-- Add `MDBX_ACCEDE` flag for database opening.
-- Using OFD-locks and tracking for in-process multi-opening.
-- Hot backup into pipe.
-- Support for cmake & amalgamated sources.
-- Fastest internal sort implementation.
-- New internal dirty-list implementation with lazy sorting.
-- Support for lazy-sync-to-disk with polling.
-- Extended key length.
-- Last update transaction number for each sub-database.
-- Automatic read ahead enabling/disabling.
-- More auto-compactification.
-- Using -fsanitize=undefined and -Wpedantic options.
-- Rework page merging.
-- Nested transactions.
-- API description.
-- Checking for non-local filesystems to avoid DB corruption.