Smart Key - Tar File Mode

If pressed within a tar-mode buffer:
  ACTION KEY
     (1) on an entry line, the selected file/directory is displayed for
         editing in the other window;
     (2) on or after the last line in the buffer, if any deletes are to
         be performed, they are executed after user verification;
         otherwise, this tar file browser is quit.

  ASSIST KEY
     (1) on an entry line, the current entry is marked for deletion;
     (2) on or after the last line in the buffer, all delete marks on
         all entries are undone.