Refines the constrained Delaunay triangulation t into a
conforming Delaunay triangulation. After a call to this function,
all edges of t are Delaunay edges.
Requirement:
The template parameter CDT should be a model of the
concept ConstrainedDelaunayTriangulation_2.
The geometric traits class of into the constrained Delaunay
triangulation must be a model of
ConformingDelaunayTriangulationTraits_2.
