A class to hold the names of structure files.
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          | __init__(self,
        ligs= [],
        count=None)Initialize the object with a list of ligand 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,
        ligfiles,
        count=None) Replace the list of ligand files with
 ligfiles. |  |  | 
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          | addData(self,
        filename,
        count=None) Adds a single ligand file name to the stored list of files.
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          | getFiles(self) Return the list of ligand file names after checking that all of them 
      exist via the check method.
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          | isFilled(self) Check whether the object is used or empty.
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          | getCount(self,
        count_if_needed=False) Return the number of items in this object.
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          | count(self) Return the number of structures in the set.
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