[PATCH] Fix up SAC calculations for ATM/bar confusion

[Chris Lewis]

>> 300 bar tanks are much heavier than same size (in litres) 200 bar tanks.
>
>
> Yes. You need less lead. Pure saving.
>
> Jukka

See http://www.nigelhewitt.co.uk/diving/300bar.html for done words on 300b
tanks

Also http://www.nigelhewitt.co.uk/diving/maths/vdw.html which should give
the requires data for the three gases we care about.

Chris
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