Improve triangulation robustness#1212
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isInCircleRobustnow computes the in-circle determinant in doubles with a Shewchuk-style error bound: if the magnitude clears the bound, the sign is provably correct and returned at full speed; otherwise it falls back to the existingisInCircleDDNormalizedextended-precision evaluation.Vertex.isCCWnow usesOrientation.index.~12% slower on a 200k random-point triangulation.
Closes #20, #298, #310, #1190 (and therefore #1138), GEOS #1286, and supersedes PR #311.