docs(pmapdump): Updated acknowlegements and copyright.
Documented scaling of photon flux by fraction of dumped photons when using -f.
Minor revisions & clarifications
Honourable mention of Capt. B. :^)
Documented -a option for point list output.
Documented change to 'glow' material and new -f option
Fixed typo
Documented new -c option for custom sphere colours
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