== To follow Triangle ==

  - Implement off-centers
  
  - Implement Chew’s algorithm instead of Ruppert's
  
      L. Paul Chew, ‘‘Guaranteed−Quality Mesh Generation for Curved
      Surfaces,’’ Proceedings of the Ninth Annual Symposium on Computational
      Geometry, pages 274−280, May 1993.
  
  - Implement Miller-Pav-Walkington
  
      Gary L. Miller, Steven E. Pav, and Noel J. Walkington, ‘‘When and Why
      Ruppert’s Algorithm Works,’’ Twelfth International Meshing Roundtable,
      pages 91−102, September 2003.


== Old TODO list ==

- Implement a method to split all clusters at the beginning.

- Histograms in the demo

- do not use default constructor of Geom_traits

- Rewrite Double_map.h [!]

- draw() called twice in mesh_demo [!]