I implemented gamut mapping in Ive's spectral rendering rig, based on method 2
of CIE.inc in Lightsys IV.  Values above 1.0 are still clipped (which can
distort the hue).  Attached are renders of a modified version of Prism.pov.  As
you can see from the Osram render, there are still some bugs to be worked out
for brighter values.

I made one change from the algorithm in MapGamut(): when finding the lowest of
the RGB channels, I used <= instead of <, because the latter would always return
the blue value if the red and green happened to be identical.  (You might want
to look into that, Ive.)

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