Added SPECULAR flag to ray samples to work better with BSDF materials
Fixed serious bug in rsensor that caused it to fail for source sampling
Bug fix related to zero rows and added check for negative sensitivities
Fixes pointed out by David G-M
Added ability to output sample rays rather than compute results
Added -n option to rtrace and moved quit() funciton out of raypcalls
Improved sampling method very slightly
Changed default view and added handling of fore clipping distance
Fixed minor inaccuracy in phi lookup
Fixed options processing
First tested version
Initial check-in of untested rsensor
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