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

[jukka.lind at kolumbus.fi]

Chris Lewis [chrislewis915 at gmail.com] kirjoitti: 
> 
> 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.
>
Could there be any "lisence issues" using that table ?
Jukka