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Code clarification about 3 confusing functions to display info: DisplayInfo (displaying a message info) and class members DisplayInfo and Display_Infos doing the same thing (see changelog)

areas can be now filled using solid polygons, or using segments to fill areas inside polygons.

Added: Zones unfill in polygon mode

solved a very subtle bug in polygon_test_point_inside.cpp. Sometimes a point outside a polygon was seen inside the polygon

Only for tests! not for production.

pcbnew: addded zones in non copper areas and starting work to use polygons in zone fill algos in not copper areas
work in progress: see changelog