[subsurface] Display "air" for imported dives with 21% O2 (#95)

[Linus Torvalds]

On Fri, Dec 30, 2011 at 1:06 PM, Linus Torvalds
<torvalds at linux-foundation.org> wrote:
>
> Does the attached patch fix the import for you?

I committed it and pushed it out since it seemed to be the obviously
RightThing(tm) to do regardless.

If it doesn't fix your problem, holler.

                     Linus