- Update to 5.3:
  General changes:
  * The support for the compiled version of CGAL is dropped.
    Only the header-only version is supported.
  Quadtrees, Octrees, and Orthtrees (new package):
  * This package implements a tree data structure in which each
    node encloses a hypercubic section of space and each non-leave
    node has hypercubic children whose edge lengths are half its
    edge length.  Such a data structure is known as a quadtree in 2D,
    an octree in 3D, and is generalized as an "orthtree" in higher dimensions.
  Triangulations on the Sphere (new package):
  * This package enables the construction and manipulation of Delaunay
    triangulations on the 2-sphere.  Triangulations are built incrementally
    and can be modified by insertion or removal of vertices.  Point location
    querying and primitives to build the dual Voronoi diagram are provided.
  File Input / Output:
  * Point set, polygon soup, and polygon mesh file I/O functions have been
    harmonized and documented:
  * Point set I/O functions can be found in the packages Point_set_processing_3,
    and Point_set_3.
  * Polygon mesh I/O functions can be found in the package BGL.
  * Polygon soup I/O can be found in the package Stream_support.
  * A comprehensive list of the supported file formats is available in the
    Stream_support package here; inversely, the following page can be used to
    find out which CGAL data structures can be used given a specific file format.
  2D and 3D Linear Geometry Kernel:
  * Added is_translation(), is_scaling(), is_reflection(), and is_rotation()
    to the classes Aff_transformation_2 and Aff_transformation_3, which enable
    determining if the transformations use a specialized representation internally.
  2D Regularized Boolean Set-Operations:

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