All HTML code and Doxygen shortcuts such as @c, @b and @em are now
rewritten using Markdown syntax, which makes it more readable.
Also updated Doxyfile. Doxygen 1.8 at least is required to generate
the documentation now.
Algorithm used: Pedro V. Sander, Diego Nehab, and Joshua Barczak, Fast
Triangle Reordering for Vertex Locality and Reduced Overdraw, SIGGRAPH
2007, http://gfx.cs.princeton.edu/pubs/Sander_2007_%3ETR/index.php
Also created new shared MeshTools library.