Add Unicode support for PolyML.export/exportPortable.
Add Unicode support for PolyML.export/exportPortable.

mn200/polyml,dcjm/polyml,polyml/polyml,polyml/polyml,dcjm/polyml,dcjm/polyml,mn200/polyml,mn200/polyml,mn200/polyml,polyml/polyml,polyml/polyml,dcjm/polyml