Shrimp Shader Generator FLTK2 GUI (SVN)

Added anisotropic Cook-Torrance (Heidrich-Seidel distribution) block.

Updated shading models header, with anisotropic Cook-Torrance model (anisotropic Heidrich-Seidel microfacet distribution function, instead of standard model's Beckmann distribution).

Preference saving of front renderer and display choosers

added renderer code to the preference file

Misc updates

Automatic platform detection

Updated fractal.h to add different distance metrics to Voronoi patterns (Tchebychev, Minkowski), and updated Voronoi blocks to use new features.

OS X compatibility

Renderer/display choosers implementation: first step

reversed input removal