Shrimp Shader Generator FLTK2 GUI (SVN)

Updated symbols definitions, so that we don't redefine macros (and have the subsequent warnings/errors).

Updated coordinate conversion blocks with add type_parent and defaults.

Added a note about the INIT_AOV_PARAMETERS macro in shadingmodels. Removed topolar2d() from shrimp_helpers, and created an header for coordinates conversions, as well as its respective blocks. Updated the Voronoi (Karlsruhe/Moscow metric) diagram block to use the new coordinate conversion. Updated the rt_environment scene (it was using some xml from older blocks).

Moritz Moeller reported shrimp.cpp was missing memory include, for std::auto_ptr. Fixed this.

Added a fix for the raytraced glass functions, so that Pixie could ignore some portions.

Added support for preset AOVs.

Bug: default preferences.xml file didn't include the renderer code

Fixed problem in the Trowbridge-Reitz distribution, using the description from Pat Hanrahan's 1995 course handout.

Fixed typo in Ks in fur block.

Changed default specular defaults for Sig2k fur block.