Shrimp Shader Generator FLTK2 GUI (SVN)

Fixed example tangent normal map scene.

Added example to use tangent space normal maps, and an included tangent space normal made (gimp generated & normalmap plugin, sobel 3x3, from capillary reaction diffusion texture/Turing pattern). Texture in .tif format, the example reads it from $HOME/.shrimp/temp/ , so the installer should copy all the textures needed to this location.

Added surface curvature on displaced surface example.

Fixed displacement and bump mapping examples.

Fixed the example woodpanel file to use the changed 2f3d voronoi(), updated fractal & extrapatterns headers for cleaned up functions, updated blocks to reflect storage change, to uniform type, for some function arguments, fBm, turbulence, VLfBm, Ridged, and the metric type for Voronoi.

Added a displacement and bump mapping examples (note: the background object needs to have the displacement shader removed, only the surface grid should exist)

Tweaked the fractals header a bit, updated the Voronoi blocks so that the metric choice variable is now of uniform storage.

Added workaround for PRMan on complex math header, as reported.

ENH: UI rework (bigger window, added scene chooser to the main window)

ENH: smaller font size as FLTK 2 (version 6671) introduced FreeType; connections drawn in light red, now different from the font colour