Minor improvements to direct specular sampling
Fixed bugs in variable-resolution isotropic BSDFs
Initial untested variable-resolution BSDF
Partial implementation of variable-resolution BSDFs
Fixed interface for determining BSDF solid angles
Changed dctimestep over to new BSDF interface and minor bug fixes
Minor changes and fixes -- first working version of BSDF material
Added missing RCS tags
Major code reorg, moving mgflib to common and introducing BSDF material
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