Update to 3.0.0.

Changes in 3.0.0

  These are mostly ABI breaking changes.
  In few cases the API also changed, but the most external one
  (the documented one) should be unchanged.

- New things:
- Added geom::BinaryOp class performing a binary operation
  using different heuristics to reduce probability of robustness
  issues. Both C-API and XMLTester now use this class for
  binary operations.
- Added covers() and coveredBy() predicates to Geometry class
- Added overlay::overlayOp() adapter class
- Added GEOSSimplify() and GEOSTopologyPreserveSimplify()
  to the C API
- Added closed ring checks in IsValidOp
- Multi-input support in XMLTester
- HEXWKB I/O
- Envelope(string) ctor
- Ruby interface
- New ShortCircuitedGeometryVisitor class
- New operation/predicate package
- Added CGAlgorithms::isPointInRing() version working with
  Coordinate::ConstVect type (faster!)
- Added getAt(int pos, Coordinate &to) funtion to CoordinateSequence
  class.
- Moved GetNumGeometries() and GetGeometryN() interfaces
  from GeometryCollection to Geometry class.
- New planarSubgraph class
- New ConnectedSubgraphFinder class.
- New LineSequencer class
- New WKTWriter::toLineString and ::toPoint convenience methods
- New IsValidOp::setSelfTouchingRingFormingHoleValid method
- New WKTWriter::toLineString and ::toPoint convenience methods
- New IsValidOp::setSelfTouchingRingFormingHoleValid method
- New Envelope::centre()
- New Envelope::intersection(Envelope)
- New Envelope::expandBy(distance, [ydistance])
- New LineString::reverse()
- New MultiLineString::reverse()
- New Geometry::buffer(distance, quadSeg, endCapStyle)
- New SnapRounding code
- New size() and operator[] interfaces to CoordinateSequence
- New ScaledNoder class
- New unit tests (make check rule)

- Optimizations:
- WKT parser speedup
- Function inlining
- Coordinate copies reduction
  - Heap allocations reduction
- More classes made final
- Better use of standard containers
- Use of singletons when appropriate
- Removed many function calls in loops' end conditions
- Improved XMLTester output and user interface
- Improved memory use in geos::geom::util::PolygonExtractor
- Ported JTS-1.7 version of ConvexHull with big attention to
  memory usage optimizations.
- Changed CoordinateArrayFilter to reduce memory copies
- Changed UniqueCoordinateArrayFilter to reduce memory copies
- Added rectangle-based optimizations of intersects() and
  contains() ops
- Inlined all planarGraphComponent class
- More iterators returning methods and inlining in planargraph.
- Obsoleted toInternalGeometry/fromInternalGeometry
- Improved buffering speed and robustness by using Snap Rounding

- Semantic changes

- SegmentString: getCoordinates() doesn't return a clone
  anymore, getCoordinatesRO() obsoleted.
- JTS packages mapped to geos:: sub-namespaces
- Geometry::getInteriorPoint() returns NULL if called
  against an EMPTY geom
- LineString::get{Start,End}Point return NULL for
  EMPTY geoms
- GEOSException is now derived by std::runtim_exception
  and thrown by const reference.
- Geometry constructors made protected, to force use
  of a GeometryFactory.

- Correctness:
- More const-correct signatures
- Stronger methods typing (removed some void * args).
- Changed index-related funx signatures to use size_t
  rather then int
- More const-correctness in Buffer "package"
- Bugfix in LineString::getCoordinate() failing to return
  NULL from getCoordinat() when empty.
- Use unsigned int for indexes and sizes.

- Layout changes:
- Namespaces mapping JTS packages
- Renamed classes after JTS names (namespaces use made this possible
  w/out name clashes)
- Splitted headers, for build speedup and possible API reduction.
- Moved source/bigtest and source/test to tests/bigtest
  and test/xmltester
- Moved C-API in it's own top-level dir capi/
- Reworked automake scripts to produce a static lib for each subdir
  and then link all subsystem's libs togheter
- Renamed DefaultCoordinateSequence to CoordinateArraySequence.
- Renamed OverlayOp opcodes by prepending the 'op' prefix, and
  given the enum a name (OpCode) for type-safety.

- Bug fixes:
- Fixed bug causing redundant linestrings to be returned in the
  result of overlaying polygons containing touching holes (#13)
- Fixed integer conversion bug
- Fixed PointLocator handling of LinearRings
- Added missing ::clone() methods for Multi* geoms

- (Partial) Detailed list of changes:
- Changed SegmentNode to contain a *real* Coordinate (not a pointer)
    to reduce construction costs.
- Changed geomgraph nodeMap to use Coordinate pointers as keys
- Envelope destructor made non-virtual to give compiler more static
  binding options.
- Changed BufferSubgraph::computeDepths to use a set instead of a
  vector for checking visited Edges.
- Made LineIntersector a concrete type
- Node::isIncidentEdgeInResult() method made virtual
- Const-correct signatures in LineMerger package
- Changed operation/valid/*NestedRingTester classes interface
  to use Coordinate pointers instead of copies.
- Changed EdgeIntersectionList to use a set instead of a vector
- Changed DepthSegment to store a real Coordinate rather then a pointer.
- Changed SubgraphDepthLocater to store real containers rather then
  pointers.
- Changed BufferSubgraph to store a real RightmostEdgeFinder and real
  containers rather then pointers.
- CoordinateSequence API changes:
- point index and size related functions
    use unsigned int rather then int
- Changed EdgeEndStar to maintain a single container for EdgeEnds
- Changed PlanarGraph::addEdges to take a const vector by ref
  rathern then a non-const vector by pointer
- Changed EdgeList::addAll to take a const vector by ref
  rather then a non-const vector by pointer
- Added apply_rw(CoordinateFilter *) and apply_ro(CoordinateFilter *)
  const to CoordinateSequence
- LineBuilder::lineEdgesList made a real vector, rather then pointer
  (private member)
- SegmentString::eiList made a real SegmentNodeList, rather then
  a pointer (private member)
- Removed coordinate copies in ElevationMatrix::elevate
- Changed CoordinateFilter interface to have a const method
  for filter_rw, updated interfaces using this to take
  const CoordinateFilter (apply_rw).

(gdt)