docs: added man page for pabopto2bsdf
Added "-r" option to bsdf2rad and bsdfview to fix plotting range
Added note about "-v 0" and made start-up with "-t" option more reliable.
Final check-ins to get evalglare working and addition of bsdfview -t option
Added information about re-using the rad input file
Minor wording improvements
Created bsdfview script and added man page for bsdf2rad
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