fix: Avoid second release of photon maps (malloc error)
Fixed off-by-one bug in photon density estimate bandwidth clamping if exceeds number of photons.
Fixed est00pid bug in single photon lookups that returned junk when none found, added code to detect and handle (ignore).
Added check for deprecated biascomp with volume pmaps in loadPmaps().
r -> r2 in photonDensity() to emphasise squared radius
Hack to render contrib pmap as regular global pmap with rpict/rtrace/rvu
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