Window_Structure:

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   Initialize a window data structure.

   Since version 7.
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   Form:
   window = Window_Structure;
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   Inputs
   ------
   none

   -------
   Outputs
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   window       (.)    Window data structure with fields:
                      - startTime       Earliest possible start time                    [sec since 1970]
                      - nOrbMin         Minimum number of orbits maneuver may last      [orbits]
                      - nOrbMax         Maximum number of orbits maneuver may last      [orbits]
                      - nManeuvers      Number of maneuvers to search over
                      - timeWeightExp   Time-weighting exponent (greater than 0)

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