non-bullet parameters. Bullet now has separate parameters
for mass, steer angle, and enigne power.
2) bullet only: Added suspension rest parameter (which might fix
the problem of karts not working on tuxtrack and other tracks).
git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/trunk/supertuxkart@1201 178a84e3-b1eb-0310-8ba1-8eac791a3b58
in this case, accelerating should be braking (and
work with more force than just accelerating).
git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/trunk/supertuxkart@1155 178a84e3-b1eb-0310-8ba1-8eac791a3b58
