SYNOPSIS:
    AUTO bits

DESCRIPTION:
    Toggle the autopilot mode. Currently the following bits
    control the behaviour:
    0x01   Enable the autopilot
    0x02   Enable automatic forward movement
    0x04   Enable automatic turning
    0x08   Enable sliding for collision avoidance
    0x10   Enable rolling to simulate gravity
    0x20   Enable turning around when dead ends are reached
    0x40   Enable marker dropping

    The behaviour of the autopilot can be influenced by setting
    serveral parameters within the $root.module.internal
    hierarchy. Currently the following members exist:
    .rolldown:   vector (x/y/z) telling where "down" is, when rolling
                 is activated
    .rollspeed:  relative speed of rolling motions. 1.0 is normal.
                 Do not set too high, as this might cause oscillations.
    .slidespeed: relative speed of sliding motions. 1.0 is normal.
