fix: Allow different front/back diffuse reflectance in BSDF library
feat: Added -rf and -rb options to rmtxop to load XML reflectance matrices
Corrected matrix for diffuse-only transmission, which needed proj. solid angle
Reversed order of matrix look-up macros to be more consistent
Switched off $RAYPATH search for XML loading in dctimestep, rmtxop
Made error messages more consistent when library file not found
Added mBSDF_chroma() macro
Add color BTDF support
Fixed improper handling of diffuse transmission matrix
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