Fix cylinder printout information

[Henrik Brautaset Aronsen]

Linus Torvalds wrote:
> Also I have no idea how metric people want to get the air usage. Anybody?
>
> The choices are:
>
>   - wet size, the same way as  (which would require working pressure of
> the cylinder in order to calculate), ie if you have a 12l cylinder, it
> would say "8l" if you used two-thirds of the gas.
>
>   - "air volume at one ATM" (the same way imperial people show cylinder
> information)
>
> I'm assuming the latter, because that seemed to be what Salvador was
> approximating (except he turned the pressure difference into bar, not
> ATM). Also, metric cylinders don't necessarily have a saved working
> pressure, so..

We usually use the number of bars consumed, since we know the tank size 
in litres already.  Otherwise, the absolute number of litres (bars * 
tank size) is OK.

Henrik
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