New Radiance html man pages

Thanks to the diligent efforts of Terry Mc Minn, we now have an updated list of manual page entries on the Radiance website, accessible via the usual means from:

For jollies, I added a link where you can download all the HTML pages if you prefer to have a local copy.

I have updated the abbreviated and comprehensive lists as well as the PDF of all man pages, so everything _should_ be there. If you spot an omission, please write to me directly and I'll see what I can do.