Merge changes from stable-1.5

[igchor]

This change is 

[pmem-bot]

@karczex and @szyrom please review this pull request

[codecov]

Codecov Report

Merging #567 into stable-1.6 will increase coverage by 7.65%.
The diff coverage is n/a.

@@              Coverage Diff               @@
##           stable-1.6     #567      +/-   ##
==============================================
+ Coverage       88.69%   96.35%   +7.65%     
==============================================
  Files              26       31       +5     
  Lines             867     2551    +1684     
==============================================
+ Hits              769     2458    +1689     
+ Misses             98       93       -5

Flag	Coverage Δ
#tests_clang_debug_cpp17	96.88% <ø> (+5.44%)	⬆️
#tests_clang_release	90.31% <ø> (ø)	⬆️
#tests_gcc_debug	97.43% <ø> (?)
#tests_gcc_release_cpp17	95.57% <ø> (+6.17%)	⬆️
#tests_gcc_release_cpp17_no_valgrind	96.63% <ø> (?)

Impacted Files	Coverage Δ
include/libpmemobj++/allocator.hpp	90.9% <ø> (+6.29%)	⬆️
include/libpmemobj++/make_persistent.hpp	88.57% <0%> (-1.91%)	⬇️
include/libpmemobj++/detail/life.hpp	98.59% <0%> (-1.41%)	⬇️
include/libpmemobj++/detail/conversions.hpp	100% <0%> (ø)	⬆️
include/libpmemobj++/experimental/slice.hpp	100% <0%> (ø)	⬆️
.../libpmemobj++/experimental/contiguous_iterator.hpp	100% <0%> (ø)	⬆️
include/libpmemobj++/experimental/array.hpp	100% <0%> (ø)	⬆️
include/libpmemobj++/pext.hpp	100% <0%> (ø)	⬆️
include/libpmemobj++/allocation_flag.hpp	100% <0%> (ø)
include/libpmemobj++/detail/temp_value.hpp	100% <0%> (ø)
... and 20 more

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