v0.13.7 "Дружба" (Friendship).

The supporting release of a stable branch with bug fixes and bug fixes,
on [International Friendship Day](https://www.un.org/ru/observances/friendship-day).

For the list of improvements and changes, please see [ChangeLog](https://libmdbx.dqdkfa.ru/md__change_log.html).

git diff' stat: 22 files changed, 682 insertions(+), 291 deletions(-)
Signed-off-by: Леонид Юрьев (Leonid Yuriev) <leo@yuriev.ru>
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