#25 Fox position makes the car difficult to drive

I think there may be a problem with the fox kitcar and fox wrc positioning. The 'pos' attribute in the .vehicle files have value "0.0, -0.2, 0.1" but looking at the svn logs (revisions 906, 939 and 947) it seems that it should be "0.0, 0.4, 0.1" for the RWD fox cars.

To try this, change the 'pos' attribute of the 'part' element to "0.0, 0.4, 0.1" in fox_kitcar.vehicle. The car should be more stable, although it has some understeer.

I attach a patch with this changes. It also sets render_pos to "0.0, -0.2, 0.1" so that the car spins correctly in the selection menu.