Minor optimizations
Improved oversampling check
Further improved sampling method
Minor improvements to direct specular sampling
Vastly improved direct specular sampling
Minor fix to through component calculation
Stratified specular sampling with -ss > 1
Partial implementation of variable-resolution BSDFs
Fixed interface for determining BSDF solid angles
Improved output efficiency by reducing number of calls to fwrite()
Fixed problem with double-counting through component in indirect
Fixed bug in source sampling for proxies
Made BSDF proxy behavior consistent for shadowing, reflection and transmission
Fixes to BSDF including blurring of angle boundaries
Minor changes and fixes -- first working version of BSDF material
Minor fixes and adjustments
Major code reorg, moving mgflib to common and introducing BSDF material
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