ListCases:

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   List the switch cases that are included in a given file.
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   Form:
   names = ListCases( filename, quiet );
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   ------
   Inputs
   ------
   filname       (:)    String name of file to examine
   quiet        (1,1)   Flag for quiet operation - no printout

   -------
   Outputs
   -------
   names         {:}   Cell array of case names

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