[ODE] box-box performance

[Daniel.Groll@t-online.de]

I have implemented this sort of thing on top of ODE. My bodies come to
rest if their velocities went under a certain length. But be careful,
there are situation where for example a box can stay on an edge. To
avoid this you have to take time in concideration. I also have
implemented this and it work great. My simulation has got a significant
speed up. Nearly all my objects are "quiet" objects in most situations.
This boosts the performance enormously!

Daniel Groll