A class to hold the names of one or more text (or log) files.
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          | check(self) Make sure all files in the list exist.
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          | __str__(self) Return a string representation of the object.
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          | setData(self,
        textfiles) Replace the list of file names with
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          | addData(self,
        filename) Add a single text file name to the stored list of files.
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          | getFiles(self) Return the list of text file names after checking that all of them 
      exist.
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          | isFilled(self) Check whether the object is used or empty.
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    | Inherited from PipeIO:getCount |