Changes 3.3.0:

- New things:
  - CAPI: GEOSBufferWithParams (allows single sided buffers)
  - CAPI: GEOSOffsetCurve deprecates GEOSSingleSidedBuffer
  - CAPI: GEOSUnaryUnion deprecates GEOSCascadedUnion
  - CAPI: GEOSisValidDetail: tell state, reason & location apart. allows
          passing flags.
  - CAPI: GEOSContext_setNoticeHandler_r, GEOSContext_setErrorHandler_r
  - CAPI: GEOSGeom_createEmptyPoint, GEOSGeom_createEmptyLineString
          GEOSGeom_createEmptyPolygon, GEOSGeom_createEmptyCollection
  - CAPI: GEOSGeom_extractUniquePoints
  - CAPI: GEOSGetGeometryN support for single geometries
  - CAPI: GEOSPolygonize_full to return all informations computed by
          the polygonizer
  - CAPI: GEOSOrientationIndex
  - CAPI: GEOSSharedPaths to find shared paths and their orientation
  - CAPI: GEOSSnap
  - CAPI: GEOSRelatePatternMatch
  - CAPI: GEOSCovers, GEOSCoveredBy
  - CAPI: GEOSRelateBoundaryNodeRule
  -  PHP: new PHP5 bindings based on CAPI
- Semantic C++ API changes:
  - Geometry inheritance chain changed to introduce Puntal, Lineal
    and Polygonal classes (virtual inheritance introduced)
  - Polygonizer::getInvalidRingLines retains ownership of vector elements
  - Geometry::isWithinDistance method is now const
  - Polygonizer::getCutEdges returns by const ref
  - Polygonizer::getDangles returns by const ref
  - Empty LinearRings are closed by definition
- Bug fixes / improvements
  - Fixed Geometry.distance() and DistanceOp to return 0.0 for empty inputs
  - Invalid compound geometries reported as valid
  - Return up to 15 digits of precision from GEOSisValidReason_t
  - CAPI: do not leak contexts when using the non-reentrant interface
  - Fix duplicated dangles returned by Polygonizer
  - Fix SnapIfNeededOverlayOp to throw the originating exception
  - Fixed LineMerger to skip lines with only a single unique coordinate
  - Fix NodedSegmentString to handle zero-length line segments correctly
    (via safeOctant)
  - Fixed buffer OffsetCurveSetBuilder to handle "flat" rings correctly
  - Added illegal state check in LineSegment::pointAlongOffset()
  - Improved performance of RectangleIntersects by always using
    segment-scanning and refining SegmentIntersectionTester
  - Reduce memory use in PreparedGeometry predicates
  - Fix infinite loop in RobustDeterminant with nan/inf input

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