Add pHe and pN2 plotting

Adjust the color for pN2 to the standard for this gas (black). We keep pO2
green (even though the ISO 32 color for that would be white). pHe is
marked in brown (which is the matching standard color).

Calculate correct partial pressures for the synthetic plot info points at
the beginning and end of the dive.

Minor fine tuning to the positioning / scaling of the temperature plot
when partial pressures are plotted.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>

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