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  Computes the damping coefficient ratio for a damper wheel.
  Assumes a symmetric spinning spacecraft with a damper wheel about
  one of its transverse axes. The damping is assumed to have 
  minimal effect on the spin rate. This function is useful for
  studying the behavior of rigid bodies with damping and for
  setting the damper wheel parameters when a damper wheel is used
  to model damping from other sources such as slosh or magnetic
  eddy currents. The damped natural frequency is constrained to be equal
  to the undamped nutation frequency
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   Form:
   [D1, D2] = DWheel( iT, iS, wS, tau, e )
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   Inputs
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   iT          (1,1)   Transverse inertia
   iS          (1,1)   Spin-axis inertia
   wS          (1,1)   Spin rate (rad/sec)
   tau         (n)     Time constant
   e           (m)     Ratio of damper wheel inertia to transverse
                       inertia

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   Outputs
   -------
   D1		    (1,1)   Ratio of damping coefficient to damper wheel
                       inertia
   D2		    (1,1)   Ratio of damping coefficient to damper wheel
                       inertia

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