Merge stable 1.7 into stable 1.8

Merge stable-1.6 into stable-1.7

Merge stable 1.5 into stable 1.6

contigous_iterator: make operator[] take signed integral instead

of unsigned.

The reason is that Windows cannot decide for a call like this:

`it[0] = 10`

whether to use:
* operator[](unsigned) -- one conversion from signed to unsigned
* operator T*() and then build in operator[](signed) -- one conversion

fix CMake issue

cmake 3.3 (which we're using) doesn't have function GREATER_EQUAL

enumerable_thread_specific: remove unnecessary include

Ref: https://github.com/pmem/pmemkv/issues/628

Remove script for updating vcpg's PMDK version

Vcpkg already has PMDK 1.8

Merge stable 1.7 to stable 1.8

Merge stable-1.6 into stable-1.7

Merge stable-1.5 into stable-1.6

fix dir creation in auto docs update

tests: cleanup source of removed test

Only parse libpmemobj version if it matches a pattern (major[.]minor.*)

doc: enable auto gh-pages generation in docker script

Ref: https://github.com/pmem/libpmemobj-cpp/issues/377

Add skip flags for additional artifacts built/installed in dockerimages

insert_erase_mt was removed but it's source stayed.

Merge stable-1.8 into master

Update docs in defragmentation class

Update PMDK dependency to 1.8

Merge stable-1.7 into stable-1.8

Merge stable-1.6 into stable-1.7