a couple of crashes with the test dives

[Dirk Hohndel]

On Mon, Nov 24, 2014 at 02:28:08PM +0100, Robert Helling wrote:
> 
> We were (I was I should say) too clever when comparing floating point
> numbers resulting in 0 not being considered equal to 0. This occurred
> when computing the scaling factor for a y-axis of an O2 plot without
> data which had a max and a min value of 0 (which happens for those test
> dives). 

I had to look at the patch and read your description before I understood
what was wrong and what the patch fixed.

-ENOTENOUGHCOFFEE

Thanks for catching that one, Robert.

/D