Added grouping parens to reduce ambiguity warnings.
Updates for 3.5 release
added stdlib.h for better reliability on some systems
Added client data pointers to context structures (vertex, color, material).
allow negative weights in cmix entity
allow negative values for spectral components
added check for illegal names and identifiers
added material index of refraction
improved box filtering of detailed spectra in setspectrum()
added conversion from (x,y) chromaticities to spectral color
added cct entity
fixed context handlers for spectral power distribution data
corrected problems with cmix function (I think -- needs checking!)
added clearing of current names to c_clearall()
bug fix in setting of current names
added "sides" entity for one- vs. two-sided surfaces
changed context names from struct members to extern variables
added c_getmaterial() call
fixed bugs made worse by last change
bug fixes and enhancements
added name and clock members to C_COLOR and C_VERTEX structures
minor fixes and enhancements
minor bug fix
added cspec and cmix entities
added prism entity and minor changes
improved table lookup routines with new delete function
various enhancements and fixes
Initial revision
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