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Add OverlayNG area check heuristic - #812
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Signed-off-by: Martin Davis <mtnclimb@gmail.com>
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Add OverlayNG area check heuristic Closes GH-527
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Adds a heuristic check that the OverlayNG result area is consistent with the inputs and the overlay operation.
Prevents erroneous results for some cases where noding is vector-clean (and hence not caught by noding validator), but causes a vertex to cross a segment and thus "invert" an area in the topology graph.
Fixes #798 and #808.
Signed-off-by: Martin Davis mtnclimb@gmail.com