[ODE] New Physics SDK released

[kronos at mtcelestia.net]

> I was very impressed by the speed of this SDK : I've created thousands of 
> boxes without any noticable impact on framerate ! (even mesh-mesh collision 
> seems very fast).
> What methods do you use ? (read: why can't I do the same with ODE :)

the solver seems to be taken almost verbatim from Pierre Terdiman's Flexine. 
it's a penalty-based method with a very small time step (seems to be around 2ms 
in the demos). since contacts are resolved immediately, it's utra-fast 
(probably as fast as it gets), and scales smoothly with the number of contacts, 
but it has some inherent limitations.