[ODE] Average Velocity feature and 'Disabling islands problem'

[Jaroslav Sinecky]

Christoph Beyer wrote:
> But there is a big problem left, the problem of disabling whole islands!
> I think, this is the main reason, because big boxstacks are so unstable 
> and trembling.
>
> Christoph
>
>   
Yep, true! There should be some kind of syncronization for bodies in 
island. Probably a body in island shouldn't disable when it alone 
reaches auto-disable condition, but only when ALL the bodies in the 
island meet this condition and then disable them all at once.

Well, just an idea...