Preparation for 4.2 release
Updated some dates
Fixed Leukos citation
Added missing comma
Added recent IES article to reference list
Removed inconsistent emphasis
Added mention of thickness sign for BSDF material
Made BSDF proxy behavior consistent for shadowing, reflection and transmission
Major code reorg, moving mgflib to common and introducing BSDF material
Updated some image converters
Incorporated other changes
Fixed misspelling of Henyey's name
Minor updates and fixes
Minor wording correction
Removed outdated reference to modifier loops, which were eliminated long ago
Fixed date
Version changes for 3.8 release
Fixed language uses ("virtual" vs. "secondary" light sources)
Updated copyright year
Update for 3.6 official release
Fixed RCS Id and grouping of terms from last change for BRDF
Renamed rview, lam, calc, and neat to rvu, rlam, icalc, and neaten
Added and updated documentation for 3.5 release
Added -a option to obj2mesh to incorporate materials in mesh
Changed alias handling to allow tracking, fixed freeobjects() and do_irrad bugs
Added documentation to repository
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