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   Draws an aircraft in the NED frame. The aircraft state vector can
   either be of type acstate or
   x.r
   x.q
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   Form:
   h = DrawAC( mode, g, x, h, units )
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   Inputs
   ------
   mode        (1,:) 'run' or 'init'
   g                 Aircraft image data structure
   x                 Aircraft state vector
   h                 Handles to the display
   units       (1,:) Units

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   Outputs
   -------
   h                 Handles to the display

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