Changes in wheel.cpp, please review/test/comment

Hi all

I changed the wheel forces calculation a bit, I would be happy if you 
review and test the changes. Changelog:
- Fixed car flying off with extreme suspension settings, see 
http://www.berniw.org/trb/forum/showthread.php?topicid=3640.
- Fixed applied force when wheel has lost touch with the ground but 
suspension is not fully extended.

http://torcs.cvs.sourceforge.net/viewvc/torcs/torcs/torcs/src/modules/simu/simuv2/wheel.cpp?r1=1.26.2.1&r2=1.26.2.2&pathrev=r1-3-1
http://torcs.cvs.sourceforge.net/viewvc/torcs/torcs/torcs/src/modules/simu/simuv2/wheel.h?r1=1.7&r2=1.7.2.1&pathrev=r1-3-1

Best regards

Bernhard

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