[PATCHES] Vary undersaturated portion of heatmap according inert gas

[Rick Walsh]

The first patch in this series (applied on top of my last) adjusts the
undersaturation zone of the heatmap (cyan to blue to black) according to
the inert fraction of gas being breathed, rather than according to the
inert fraction of air.

The second patch just stretches out the yellow portion, because otherwise a
typical deco dive with moderate conservatism appears a bit too green for my
liking.

I've attached a couple of screenshots to compare the difference.

Robert, could you please comment?
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