docker: add missing hub package

docs: update miscellaneous Doxygen comments

it wasn't added into Fedora 34, while we bumped 'doc' job to use latest Fedora.

docs: update and extend containers information

CI: use Fedora 34 instead of 32, since 32 is EOL now

as long as it's working it can run in nightly build.

Merge stable-1.12 into stable-1.13

Fix Docker image version(s) in CI

CI: update valgrind to 3.17

It's copy pasted from pmemkv (0d764bd).
Without this fix doc job may fail if image changed for master.

This solution is copy-pasted from pmemkv (70cd9e4).
Without this change PRs created against any stable branch may end up failing,
because it uses 'latest' image, instead of proper stable (e.g. '1.13') image.

We now use x.y.z format for all releases and the regex did not work well
with 1.13.0 release.

our pmemcheck tool was recently rebased to upstream 3.17 version.
It contains at least few useful bug fixes, e.g.:
https://bugs.kde.org/show_bug.cgi?id=426144
https://bugs.kde.org/show_bug.cgi?id=407764

Avoid libunwind on valgrind tests

docs: fix docstring

Initialize atomics in ringbuffer

It's less error prone to initialize atomics with default value, than not
initializing and calling store() in every constructor.

[doc] add description for Transaction API feature

This commit provides user introduction to transaction world.

tests: add more TCs for pool

and extend comments in existing ones.

Make exception_with_errormsg take arbitrary num of params

Fixes problem with loosing category on with_pmemobj_errormsg() call.

Fix file description and include guard name

to minimize dependencies of common.hpp

Add decoration to exceptions instead of calling method

Idea behind this PR is to remove duplicated methods from exception classes.

Make index_sequence helpers compatible with std versions

This change enables creating index_sequences from single number.

Disable useless graphs

Make cpp-format targets always working

Those graphs only add unnecessary complexity to the documentation.