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   Generate a target quaternion by limiting the total angular change.
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   Form:
   [qTargetToBody,qOld] = DeltaQTarget(qCommand,qIToB,qOld,deltaAngle)
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   ------
   Inputs
   ------
   qCommand    (4,1)   Commanded inertial quaternion
   qIToB       (4,1)   Current body quaternion
   qOld        (4,1)   Previous inertial target
   deltaAngle  (1,1)   Maximum angular change for new target

   -------
   Outputs
   -------
   qTargetToBody (4,1) Target to body quaternion
   qOld          (4,1) Memory of inertial target

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