DeltaQToRate:

Path: Common/Quaternion

% Angular rate from small quaternion changes.
 This assumes small dT and small changes in q.

 Type DeltaQToRate for a test with a random quaternion.
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   Form:
   omega = DeltaQToRate( q1, q2, dT )
 or
   omega = DeltaQToRate( q, dT )