simuv3 collision stabilisation

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The current main torcs CVS now has a much more stable simuv3 collision
code.  It turned out that, when the car was at extreme angles, sometimes
the wheel/suspension force calculation would overflow.  I still must
look into why this happens, but for now I am just checking for nans.
This is sufficient to make the code work OK.

The collision with the floor is also now handled gracefully, although
the simulation is still a bit rough. However, if your suspension is too
soft, prepare for problems :)

The changes are in the CVS, please test.
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