AddScan:

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   Add a scan to the scan data structure array.
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   Form:
   scan = AddScan( data, sensorType, sensorID, param, scan )
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   ------
   Inputs
   ------
   data         (.)    Data
   sensorType	(1,1)   Integer for the data type
   sensorID    (1,1)   Integer for sensor ID
   param        (.)    Parameter data structure
                       .hFun   (1,:) Pointer to measurement function
                       .hData   (.)  Data structure for the measurement
                                     function
   scan         (:)    Scan data structure

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   Outputs
   -------
   scan         (:)    Data structure array with new scan appended
                       .data       (.)   Data
                       .sensorType (1,1) Integer for data type
                       .sensorID   (1,1) Integer for sensor ID
                       .param      (1,1) Parameter data structure

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