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   Computes the position and velocity of a satellite in the Hills frame for a
   leader/follower formation given the distance from the center (d), the number
   of spacecraft (nSC), and the order in the line.
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   Form:
   state = LFState( d, nSC, order )
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   Inputs
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   d                 (1)     distance from reference point (km)
   nSC               (1)     number of spacecraft
   order             (1)     order in the line

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   Outputs
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   state            (6,1)    final state for the spacecraft in Hill's frame

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