* Printing cleanup

Add Input/Output
Simplify element type
Simplfy Node printing  implementation, try to de-noise it a bit
Enable printing of Node*

* Adjust printing

* Add doc note

* Update src/ngraph/node.cpp
Co-Authored-By: Robert Kimball <robert.kimball@intel.com>

* Update src/ngraph/node.hpp
Co-Authored-By: Robert Kimball <robert.kimball@intel.com>

* Cleanup

* typo
Co-authored-by: Robert Kimball <robert.kimball@intel.com>