Routing with terrain data

[Robert Voigt]

I'd like to have terrain data taken into account for routing. I've read the code in the SRTM branch. I don't really understand the function in SpeedProfile::getModifiedSpeed(). Christian, could you explain a bit the parameters downDeadZone and upDeadzone? MaxDown and maxUp are obvious, and upHalfSpeed is probably the incline where the speed is half the speed of a flat way.