feat(rpict,rtrace,rcontrib,rtpict): Hyperspectral rendering (except photon map)
docs: Updated license and copyright using verbiage from LBNL's IPO
chore: follow-up to official 5.3 release, working on 5.4 alpha now...
Moving on to version 5.3a
Created psketch program for sketching out objects using named modifier(s)
Minor fixes for 5.1 release
Updated release number for next time.
Preparation for 4.2 release
Changes to support new Cmake build system
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