SYNOPSIS:
    VOL_TURN x|y|z|init [degrees]

DESCRIPTION:
    Turn the volume around its x, y or z axis, or re-initialize
    the volume to be aligned to the axis of the camera coordinate
    system. If the mode is not "init", degrees is required and
    gives the number of degrees to turn.

SEE_ALSO:
    VOL_OFFSET, VOL_SCALE, VOL_SET, VOL_GROUP
