Diffs are:
* #undef added
* in old files, (void)0 is replaced by static_cast<void>(0)
* in old files, lines as "# define CGAL_xxx_assertion 1" are added
* in point_set_processing_assertions.h, surface_mesh_parameterization_assertions.h, surface_reconstruction_points_assertions.h, "|| defined(CGAL_NDEBUG)" is replaced by "|| defined (NDEBUG)"
* protective macros (if any) are removed
* included files if any (<CGAL/assertions.h>, <CGAL/trace.h>) are removed