* URLDownloadList - fixed deleteFile method, so it wont delete the
object from the file system, if it is a directory.
* CLDownloadSelectedMenu, Downloader - to test if an object is a
directory, as I am not all that concerned with whether it is a symlink,
the program will attempt to list the files, if it is not a directory it
will return null. 
      - Added a new status to Downloader, for killing a download thread
if the destination (and parent directory) do not exist.