2) Config files will now use nitro/drift instead of wheelie/jump.
Old config files will automatically be updated (and a message
be printed).
3) Renamed all members of the kart control structure to start
with m_ .
git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/trunk/supertuxkart@2737 178a84e3-b1eb-0310-8ba1-8eac791a3b58