Calculate gas use in recreational mode

[Joakim Bygdell]

With the addition of gas reserves in recreational mode, 
we need to make sure that the first leg is short enough 
that we have more than the specified reserve of gas left at the end of the leg.

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> On 04 Apr 2015, at 18:45, Robert C. Helling <helling at atdotde.de> wrote:
> 
> Hi,
> 
> <0001-Take-gas-consumption-into-account-for-recreational-mod.txt><0002-Spelling-corrected.txt>
> 
> this adds a gas use calculation to recreational mode. Now, we also ascent when we would run out of gas (using a reserve of 40bar and taking buddy breathing for the ascent into account).
> 
> This is only calculated if there is valid cylinder info (in particular cylinder volume and starting pressure). So, if the user wants to calculate with true NDL, the cylinder volume or the working pressure should be set to 0. (This remark is for the manual…)
> 
> And I fix an embarrassing typo.
> 
> Best
> Robert
> 
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/Jocke