[PATCH] Identify below floor event type properly.

[Michael Andreen]

On Friday 26 July 2013 20:51:27 Michael Andreen wrote:
> This event is on when accumulating deco time. Once you reach the floor
> deco time will start decreasing and the event will stop. Going below the
> floor again will re-activate the event.
> 
> Also identify event type 13 in DM4 imports as airtime.

Noticed that this has not been pushed yet. Any chance of getting it applied? 
Should apply cleanly on current master.

/Michael