Add UT to test atomic_persistent_aware_ptr with both options.

docs: update miscellaneous Doxygen comments

docs: update and extend containers information

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.

As cpp-format targets are always generated anyway, they should work even
if CHECK_CPP_STYLE flag is disabled.

[string_view] add description for methods in string_view

Update doxygen config

Added missing description for methods and comment fix.

It generates a lot not relevant documentation for helper methods

It's needed to rename "Modules" section into "Features"

https://www.doxygen.nl/manual/customize.html

It's needed for ebr_0_drd and radix_concurrent_ierate_0_drd

Fixes #1076

Include graph is extremely unreadable, and not really useful

using Doxygen 1.9.1 version.