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   Compute range of allowable initial rates for the dual spin turn
   given a momentum wheel aligned with pitch and the initial rate 
   about yaw.
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   Form:
   [wIMax, wIMin, wFMax] = DSTCrit( iWheel, iPitch, iRoll, iYaw, hW )
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   Inputs
   ------
   iWheel      (1,1) Wheel inertia
   iPitch      (1,1) Pitch axis inertia
   iRoll       (1,1) Roll axis inertia
   iYaw        (1,1) Yaw axis inertia
   hW          (1,1) Final momentum wheel momentum

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   Outputs
   -------
   wIMax       (1,1) Maximum allowable yaw rate
   wIMin       (1,1) Minimum allowable yaw rate
   wFMax       (1,1) Final pitch axis rate

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