This code is for now disabled in the stk_config.xml file, since it needs
changes to the physics to be better playable.
git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@4422 178a84e3-b1eb-0310-8ba1-8eac791a3b58
and had the default value for zipper-max-speed-fraction) missing.
git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/branches/irrlicht@3911 178a84e3-b1eb-0310-8ba1-8eac791a3b58