Shrimp Shader Generator FLTK2 GUI (SVN)

Added example network illustrating conversion of normals to a RGB tangent space normal map.

Fixed light shader headers (accessing Cl and Ol outside solar and illuminate constructs, although the specs only mention L being exclusively accessible inside solar and illuminate constructs).
Fixed storage class of samples, bias and filter width of light blocks.

Updated remaining example files.

Updated examples for the tweaked blocks. 2 examples missing still.

Added Displacement "null" to the box geometry in the preview ribs. This will most likely be replaced later, with separate context shaders for each piece of geometry (and ReadArchives). The rib files need a cleanup.

Updated header.

Prefixed existing headers with rsl prefix, preparing support for other languages, and replaced existing headers inclusion in blocks, and rib_root_block.
Added missing usage information, or tweaked existing one, in current blocks.
Added workarounds for different renderers, particularly in raytracing.
Replaced preprocessor directives and macros where needed. Tweaked storage class defaults where needed.

Removed temporary output variables from the output pads in the Voronoi block, and replaced them by variables in the rsl_code, with the $(blockname) suffix, so that they're always unique.
Tweaked the usage information of all raytracing blocks, and replaced the multiple occurrences of the shadeops (with really large parameters lists, like occlusion()), by a single call, with a macro RAYOPTIONS as argument, containing the specific options for each renderer, where possible, or NOSHADEOP where shadeop isn't available. Tweaked the storage class of the variables, their defaults.

Changed caustic block, added workaround for Pixie and Aqsis. In Pixie's case, implement caustic() funcionality via photonmap(). In Aqsis's case, skip/return 0.

Updated regular pattern blocks. Added storage class where needed, update the usage information.