Mouse interface
===============

Simple left-click, middle-click, and right-click - rotate the entire
scene around x, y, and z.

Shift+any of the clicks - rotate in the opposite direction around the
same axis.

Ctrl-left-click - rotate the vehicle around the y axis.

Keyboard interface
==================

Vehicle control
---------------
up   -  accelerate
down -  slow down (decrease the throttle)
left -  turn left
right - turn right
space - break down

Shift + arrow keys
------------------
S-up   -  translate the view up along y
S-down -  translate the view down along y
S-left -  translate the view left along x
S-right - translate the view right along x

Other view changes
------------------
Page-Up   - zoom in
Page-Down - zoom out

d         - default view
s         - view from the same distance as the default view, but 
            slightly from above; good for going uphill
e         - a view from far and above

Other vehicle operations
------------------------
r - reset the motorcycle to the initial position in a stopped status
y - reset the motorcycle to the initial position in a stopped status
    facing the opposite direction
b - move the vehicle to a given position
p - toggle the automatic pilot on and off; also toggles the timer on 
    and off
t - toggle the timing on and off

Information output
------------------
Insert - output the status of the motorcycle (acceleration, speed,
         throttle, breaks, road triangle, position, and orientation)
v      - output the current view
