Numerous changes to FileManager hierarchy, including a stub for the SwingWorker type to be returned by methods of the "SwingWorkerFileManagerment" class and (incomplete) JUnit tests for this class.  The project compiles and tests successfully with Ant.  Just wanted to get this hierarchy nailed down a bit more whereas I injected a small amount of code into the hierarchy's abstract class yesterday and wanted to start some tests for it "like yesterday".