A simpler solution to the levitating car problem

1. I discovered this morning when trying to reproduce this problem
with simuv3, that the setup i sent you will not reproduce the problem.
The setup i attached to my first post will reproduce the problem
with both sims.

2. It occured to me this morning that i never tried removing the change
i made to simu.cpp after i changed racemain.cpp.  I discovered that
the simu.cpp change is not neccesary.  In fact, the change causes
some cars to drift laterally on the track until the race state changes 
to race.

Thank you, Christos, for bearing with me while i tracked this problem
down.

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