* Partially fixed visibility for symbols:

* Resolved issues with RTTI and AppleClang

* style

* review fixes

* fixed compilation with msvc 2019

* Export extra API which is used in other public classes

* CMAKE: MSVS -> MSVC

* Fixed template export

* Fixed compilation flags

* Fixed default args

* removed self-inclusion

* export

* shape

* export strides

* Export all symbols needed for OpenVINO

* Export

* disable cpu

* AxisSet

* disable warning

* fix

* removed second declaration

* fixed runtime exports

* Reverted some changes

* Fixed LNK2005 error on Windows

* Fixed code style check

* Fixed EnumAttributeAdapterBase

* Remove export of template classes

* Fixed code style for EnumAttributeAdapterBase

* Fixed for protobuf

Add source release creation script.
Read version from TAG if source is not a git repo.

* Add MPI_Bcast to nGraph core

* Add mpi_broadcast op and pass the unit test on CPU backend

* Modify API for MLSL

* Remove unused variable

* Fix the format

* Add the op call in python/pyngraph/ops/regmodule_pyngraph_op.cpp.

* Fix emitter function for DistBroadcast op

* Fix format

* Fix the emitter function for distbroadcast op

* Fix format

* Delete the reference code for distbroadcast op

* Include mlsl.h from ngraph build for genernal external usage

* Change back for build

* Fix alphabetical order issue and line space

* Rename disbroadcast to broadcastdistributed

* Change back continue

* Update the changes

* Fix style

* Delete unused variables

* Change some text format

* Add support for interpreter backend for broadcastdistributed

* Delete some redundant code

* Fix format

* rename

* remove unused file

* More renames

* renaming

* Remove one unused file

* Fix a bug

* add back redundant

* One more commit

* More commits

* Unify distributed_send and distributed_recv functions

* Fix format

* update licenses for 2019

* style

* wip

* wip

* style check checking

* try cmake version of check/apply style

* update style check to print list of files in error

* cleanup

Replaced the git command 'ls-repote --tags' with  which produces the same output but works for clones without branches (#2066)

* add nop backend

* nop backend

* fix flag name

* add new switch to cmake output of switch settings

* add new unit test to igpu manifest

* remove redundant test

* Update "JSON for Modern C++" to a version that officially supports gcc 4.8

* "JSON for Modern C++" is header only and does not need to be configured.

* move backend specific test files to test/backend directory

* remove unit_test_control

* move tests back to test root

* fix comment

* wip

* fix manifest

* backend libraries now found in tree

dynamically read header search paths

fix running from install

* Add mechanism for disabling specific backend unit tests from a manifest file.
Populate the test manifest files for CPU, GPU and INTERPRETER.

* update docs for new manifest controlled transformer unit tests

* migrate files

* apply version number to libngraph.so

* fix cmake running with empty build directory

* patch working

* wip

* fix patcher

* remove debug message:

* cleanup

* fix typo

* add support for both command line arg and env var to set NGRAPH_WARINGS_AS_ERRORS'

* Add mention of blob ref of original file from caffe2

* Mention location of source listing originally from LLVM project

Reused from Caffe 2 (Apache Licensed)

[Link](https://github.com/caffe2/caffe2/blob/master/cmake/Modules/FindCuDNN.cmake)

- Adds Sphinx docs support.

- Sphinx and Doxygen docs now built by CI.

- Sphinx and Doxygen docs now installed by `make install`.

add cmake finder for graphviz dot program and then conditionally compile visualization based on finding