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   Compute initial velocity and flight time for a missile trajectory

   Given an initial altitude and flight path angle for the missile, compute
   the required velocity for it to hit the target. The target is located at 
   a given altitude and a specified angular distance (around the Earth) 
   away from the missile.
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   Form:
   [V,tF] = MissileVelocity( gamma, h0, hF, angleDist )
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   Inputs
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   gamma           (1,1) Initial flight path angle (rad)
   h0              (1,1) Initial altitude (km)
   hF              (1,1) Final altitude (km)
   angleDist       (1,1) Angular distance of flight around Earth (rad)

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   Outputs
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   V               (1,1) Initial velocity required (km/s)
   tF              (1,1) Flight Time (sec)

   See also MissileDistance, MissileLambert
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   References:   Zarchan, P. (2002) Tactical and Strategic Missile
                    Guidance, 4th Edition, pp. 239-244.
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