Merge pull request #21 from Tectu/master

Merge Tectu Changes
Change GDISP poly fns to support translation

Change GDISP poly fns to support translation - required for adding poly
functions to GWIN
GWIN Graph - use GDISP point definition
GWIN doc update and poly functions

Add poly functions to GWIN
Move doxygen documentation to header file
Merge pull request #43 from inmarket/master

GDISP, GWIN updates