1) on road/off road is now detected with a certain tolerance
to the drivelines (currently 15%), i.e. the drivelines are
made 15% wider.
2) Skipped segments distance was shortened to 50m (since it
should be used less with the above higher tolerance, and
it caused problems with shortcut not being detected.
3) The new drivelines with tolerance can be seen with --track-debug=4
(--track-debug=2 shows the original drivelines)
git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/trunk/supertuxkart@2890 178a84e3-b1eb-0310-8ba1-8eac791a3b58
2c0a135d94