This class provides a proxy to the JOptionPane class so if a different notification
method is developed they can be changed centrally within the Display class.
This method first reads the options from the options file, if all of the
necessary options have been set as determined by the isReady() method
in the Options class, the method proceeds.
Creates a new DuplicatesTask object given the Display object to
show progress, an ArrayList of files to contain duplicate files found,
and the SongTable object to display files that have been found to be duplicates.