Hi all users of GEOS,

GEOS 3.8.0 has been released!

http://download.osgeo.org/geos/geos-3.8.0.tar.bz2

This is a performance and internals release, primarily, that has
ported many improvements in from JTS, added arbitrary precision
support to improve operation robustness, modernized the use of C++
idiom in much of the code base, and applied numerous performance
improvements, both algorithmic from JTS and in the C++ implementation
practices.

Thank you to everyone who has contributed!

Please report any issues you find in building or running tests on the
GEOS ticket tracker https://trac.osgeo.org/geos/ or to this list.

- New things:
  - CAPI: GEOSBuildArea (#952, Even Rouault)
  - CAPI: GEOSMakeValid (#952, Even Rouault)
  - CAPI: GEOSPolygonize_valid (#727, Dan Baston)
  - CAPI: GEOSCoverageUnion (Dan Baston)
  - CAPI: GEOSCoordSeq_setXY, GEOSCoordSeq_setXYZ,
          GEOSCoordSeq_getXY, GEOSCoordSeq_getXYZ (Dan Baston)
  - CAPI: GEOSMinimumBoundingCircle (#735)
  - CAPI: GEOSGeom_createPointFromXY (Dan Baston)

- Improvements:
  - Improve overall performance by reducing of heap allocations (Dan Baston)
  - Improve performance and robustness of GEOSPointOnSurface (Martin Davis)
  - Improve performance of GEOSPolygonize for cases with many potential
    holes (#748, Dan Baston)
  - Support extended precision calculations (ttmath) and port JTS
    improvements related to extended precision (Paul Ramsey, Mateusz Loskot)
  - Improve performance of GEOSPolygonize for cases with many or complex
    shells (Dan Baston, Martin Davis)
  - Improve performance of Delaunay triangulations / Voronoi Diagrams
    (Dan Baston)
  - Improve performance of prepared geometry operations (Dan Baston)
  - Improve robustness of Delaunay triangulations (Paul Ramsey, Martin Davis)
  - Improve performance of unary union for lines (Dan Baston)
  - Improve general predicate, overlay, and buffer performance (Dan
Baston, Paul Ramsey)
  - Improve cascaded union performance (Paul Ramsey, Martin Davis)
  - Allocate default GeometryFactory singleton on the stack (Sandro Mani)
  - Harmonize XML tests with JTS and harmonize cmake/autoconf
    test running (Paul Ramsey)
  - CMake modernization (Mateusz Loskot, Paul Ramsey, Dan Baston)
  - Return unique_ptr from most methods that produce a new geometry (Dan Baston)

- Changes:
  - Constructive geometry functions in CAPI now preserve SRID
    of input arguments in output (#896)
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