Shrimp Shader Generator FLTK2 GUI (SVN)

Updated usage information for more blocks.

Tweaked matrix setcomp(), with extra usage info, and added matrix inverse block. In 3delight's case, inverse() is used.

Added legacyframebuffer for Aqsis's entry in the renderers description file.
Updated more blocks, with usage information. Updated area() block to consider strategy, shading or dicing, and added workaround for Aqsis's case, which only supports the area() shadeop with a single argument

Added some more fixes to blocks. Note the in 4D fractal noise, cellnoise, etc... typically the global variable time is used (which is the block's default as well), as provided by RiShutter, and storage class is uniform. There's some work ahead.

Added some more refinements to the blocks: adding more detailed usage information, or just adding it when missing, and fixing xml special chars. Tweaking funcionality a bit where required, and generally making things easier to read for the user.

Updated blocks, small fixes, workarounds for some renderers, small extensions for specific renderers, updated usage information as needed. Fixing XML special chars inside usage as well.

Small typo, forgot the & special character.

Modified the diffuse block to add the option to use Pixie's diffuse() in its 2nd form, with 3 arguments (surface point, normal, and angle).

Update to filterstep() and spline() shadeops, added extra filters supported by Pixie: blackman-harris, mitchell, sinc.

Added __nondiffuse and __nonspecular to light shaders, local illumination models proceed according to return status from lightsource() and these variable's content. Fixed cracked glazed clay example and point initialization in Voronoi blocks.