Merge stable-1.6 into stable-1.7

[igchor]

This change is 

[codecov]

Codecov Report

Merging #674 into stable-1.7 will increase coverage by 0.16%.
The diff coverage is n/a.

@@              Coverage Diff               @@
##           stable-1.7     #674      +/-   ##
==============================================
+ Coverage        96.5%   96.67%   +0.16%     
==============================================
  Files              30       32       +2     
  Lines            2091     3484    +1393     
==============================================
+ Hits             2018     3368    +1350     
- Misses             73      116      +43

Flag	Coverage Δ
#tests_clang_debug_cpp17	97.25% <ø> (+0.32%)	⬆️
#tests_gcc_debug	95.57% <ø> (-2.31%)	⬇️
#tests_gcc_release_cpp17_no_valgrind	86.47% <ø> (?)

Impacted Files	Coverage Δ
include/libpmemobj++/experimental/basic_string.hpp	99.88% <0%> (-0.12%)	⬇️
include/libpmemobj++/make_persistent_atomic.hpp	100% <0%> (ø)	⬆️
.../libpmemobj++/experimental/concurrent_hash_map.hpp	94.55% <0%> (ø)
...nclude/libpmemobj++/detail/persistent_pool_ptr.hpp	96.15% <0%> (ø)
include/libpmemobj++/make_persistent.hpp	91.89% <0%> (+0.22%)	⬆️
include/libpmemobj++/experimental/vector.hpp	98.85% <0%> (+0.38%)	⬆️
include/libpmemobj++/allocator.hpp	93.33% <0%> (+6.66%)	⬆️

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[lukaszstolarczuk]

Reviewed 1 of 3 files at r1, 1 of 1 files at r3, 1 of 1 files at r4.
Reviewable status: complete! all files reviewed, all discussions resolved