Fast Training should be interuptable

[gordonwatts]

The fast training (step 3) should be interruptable. Let it start running, then user clicks a button and it gives the best result at that time. It would be further awesome (if possible) that the training continues in the background - so you could check up on how it was going as it continue to go.

This would be especially useful in the tutorial towards the end when they are playing with the software a bit. At WOMAD some groups put in really high numbers and then wanted to let it go forever, and see if they could get a "High Score"