Merge stable-1.13 into master

Turn libunwind off for valgrind tests

It's set in our CI scripts to 0 by default, it's unnecessary to duplicate it.

Add deleted assignment operator for persistent_aware ptr

implementation details were moved into a "private" comments.

[doxygen] Add description for primitives group.

Add pmreorder tests for atomic persistent-aware ptr

Atomic persistent-aware pointer

Add UT to test atomic_persistent_aware_ptr with both options.

utils: add pipeline for Jenkins

Added new jenkinsfile and pipeline to libpmemobj-cpp repository meant to start pmem jobs

Signed-off-by: tszczypx <tomaszx.szczypiorowski@intel.com>

docs: extend docs for Data View group and its classes

Extend allocation feature docs

[doxygen] add description for "exceptions" group

Documentation tweaks

This is cosmetic change, made mostly to simplify copy-pasting from
documentation.

CI: minor updates

Add gdbserver support to ctest

it is supposed to be a replacement for CentOS, which will be EOL soon,
(potentially along with RockyLinux, in the future).

Merge stable-1.13 into master

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.