Shrimp Shader Generator FLTK2 GUI (SVN)

Implemented the Export Scene menu

Added tooltips to all the main window's widgets

Removed anisoct block, since it's included in new Cook-Torrance block.

Updated fractal.h for unitialized variable warning in voronoi functions. Added simple shadeop to access glibc's complementary error function, used in the Cook-Torrance shading function, for the He-Torrance geometric attenuation. Updated all shading models in respective header. Updated Cook-Torrance block to add access to multiple microfacet distributions, and geometric attenuation functions, defined in distributions2.h header. Updated shading models header to add new Cook-Torrance model. Improved all other shading models. Removed anisoct block, since it's not part of the new Cook-Torrance block.

Separated type and storage in 'add input' dialog, added checks for empty names

Removed the overview menu item which isn't yet implemented

Updated lights header to remove environment light, and removed area light and environment light blocks. These some work, as well as matching rib updates. They'll be re-added later, when everything's working properly.

Updated lafortune block for typo (colormatrix type is float, _not_ color). Also updated anisotropic CookTorrance block for typo, and respective model declaration in shading models header.

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).