because it was never used, and probably was erroneous (not re-calculating offset).

Since we want to widely use non-template version of base class it's
better to have it in main (pmem::obj) namespace.
Thanks to that it can be used as a type e.g. in vector to
store pointers of various (template) persistent_ptr elements.

persistent_ptr_base is changed to enable usage e.g. as a generic
parameter for a function requiring any persistent_ptr.
Non-template version of the base class is perfect for that.
Rationale for this change is a defragmentation feature, which will operate on
various persistent_ptr's.

Ignore the patch part of a program's version

Do not run anything on appveyor

The patch part of a program's version almost never matters.

This change is needed to accept clang-format v9.0.1 when v9.0 is required.

Windows builds are now being run on github actions.

Add running tests on Github Actions for Windows

Merge changes from stable-1.8

Not passing required flags caused error on windows. Also including
libpmemobj.h cause inclusion of type macros which would case problems
with offsetoff deifnition on newer VS.

Concurrent hash map does not depend on v<>.

this allows vcpkg integrate install to find the libraries. This allows
to run cmake without the need for specifying CMAKE_PREFIX_PATH

Add Windows build to GitHub Actions

Add ndctl and daxctl packages to satisfy install-pmdk

install-pmdk.sh script requires ndctl and daxctl packages
to be installed when installing PMDK from packages.

Segment vector doc fixes

After moving out of experimental, we oficially only support our own
3 policies. This patch removes information about specifics of those
policies - this is something which might change.

Print found version of clang-format in error message

Move segment_vector out of experimental

Set the commit range in case of GitHub Actions

It fixes rebuilding the image in case of GitHub Actions

Disabling it is not neccesary.

Change the default Policy of segment_vector
from exponential_size_array_policy to exponential_size_vector_policy.

enumerable_thread_specific has to have 'exponential_size_array_policy'
as Storage, because its storage must not do reallocations.

enumerable_thread_specific: fix

fixed datarace and test added