Added a filter to the Delaunay Triangulator to insure that incoming points

are unique in the X and Y components.

include/osgUtil/DelaunayTriangulator

@@ -167,6 +167,8 @@ private:
 
     // GWM these lines provide required edges in the triangulated shape.
     linelist constraint_lines;
+
+    void _uniqueifyPoints();
     
 };