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   Constant thrust minimum time orbit injection.
   Compute the initial and final burn angles and total delta-v for a
   constant thrust minimum time trajectory. Assumes a constant gravity
   field and a flat planet model. Assumes a constant mass vehicle.
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   Form:
   [dV, beta] = MinTOrbitInjection( h, u, a, g )
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   Inputs
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   h           (1,1) Altitude
   u           (1,1) Final horizontal velocity
   a           (1,1) Acceleration
   g           (1,1) Graviational acceleration.

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   Outputs
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   dV          (1,1) Total delta-v
   beta        (2,1) [beta0;betaF] (rad)

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