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   Computes spin precession maneuver data for fuel budgets
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   Form:
   x = SPMDataF( inr, cM, w, attI, attF, pwF, jD, thrusters )
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   Inputs
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   inr           (1,1) Spin axis inertia
   cM            (3,1) Center of mass
   w             (3,1) Spin rate (rpm)
   attI          (1,2) Initial [ra,dec] (deg)
   attF          (1,2) Final [ra,dec] (deg)
   pwF           (1,1) Pulsewidth fraction
   jD            (1,1) Julian date
   thrusters     (1,n) Thruster IDs

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   Outputs
   -------
   x             (1,12+n)  Formatted data

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