Add GEOSCoverageUnion #158
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Tests copied from https://github.com/dbaston/CoverageOp and should be reviewed.
- Use STRtree for assigning holes to shells - Use IndexedPointInAreaLocator for testing shell-in-shell containment - Remove potential N^2 search for setting shell inclusion
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Implement an optimized union function for the special case of non-overlapping polygons. This still needs a hash implementation for
LineSegment.@dr-jts let's take a look at the test cases