FindDriftTerm:

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   Find the "deadband over drift rate sigma" term that results in the specified
   probability "p" of NOT reaching the deadband by time "t".

   Since version 7.
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   Form:
   [n,foundSoln] = FindDriftTerm( p, t );
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   Inputs
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   p          (1)      Probability that the deadband will NOT be reached
   t          (1)      Time horizon [orbits]

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   Outputs
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   n           (1)     Deadband over drift rate sigma term
   foundSoln   (1)     Flag indicating whether a solution was found or not

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