xDeep Black Bottom Timer UDDF import

[Dirk Hohndel]

On Thu, 2013-12-05 at 09:33 +0100, Henrik Brautaset Aronsen wrote:
> Just in case anyone was interested:  The new xDeep Black Bottom Timer
> [1] works out of the box with Subsurface :)

Cool - we need to make sure we add that to the list of supported DCs!

That's usually something I create at the very last minute - but if
someone wants to get a head start on that, please feel free to assemble
one.

Let's put this in the README (which also still needs to be updated for
Subsurface 4.0

/D