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   Computes the delta-v for a coplanar Hohmann transfer
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   Form:
   [dV, dV1, dV2, eT, aT] = DVHoh( r1, r2, v1, mu )
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   Inputs
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   r1                    Radius 1
   r2                    Circular Orbit radius 2 (target)
   v1                    Velocity 1
   mu                    Gravitational parameter

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   Outputs
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   dV                    Total required delta-v
   dV1                   Transfer ellipse injection delta-V
   dV2                   Final orbit injection delta-V
   eT                    Eccentricity of the transfer orbit
   aT                    Semimajor axis of the transfer orbit

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