DateChanged:

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   Find a list of files in the directory who have been modified
   after 
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   Form:
   d = DateChanged( date, directory )
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   ------
   Inputs
   ------
   date          (1,:)   Date to compare in string format
   directory     (1,:)   Directory to check

   -------
   Outputs
   -------
   d             {:}     Files with modification dates after date  

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