Added protection against negative and NaN values on input
Added call to flockfile() to reduce i/o overhead
Fixed reciprocity averaging error discovered by Zack Rogers
Added missing option from usage line
Added reciprocity averaging
Fixed bug in data ordering
Fixed bugs in variable-resolution isotropic BSDFs
Improved percentile thresholding measure
Fixed bug in missing persist file and changed to percentile-based threshold
Initial rttree_reduce implementation
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