[ODE] problems with hinge2 & car steering

[Chris Campbell]

what is the friction in the wheel contact with the ground? If it is too high
(or dInfinity) you will get these problems

> I'm coding a simple vehicle simulation with Hinge2 joints (yes, 
> yet another buggy-derivated driving model)  but I'have problems 
> trying to keep the car stable when turning.  The wheels are 
> simulated with single spheres which are connected to the body 
> with the hinge2's.