Debugs for FileManagement

Recommending an immediate merge of these changes, made today, for the FileManagement package (there is also a minor change to a test in the FileDiscovererTest.java file).  Changes involved the addition of a test this morning, meant to simulate the output of a FileEnumerator, which identified numerous deficiencies in the SwingCopyJob class.  There will be additional changes to FileManagement made tomorrow.