r216: Check for copying a directory onto itself, as well as into itself.

r216: Check for copying a directory onto itself, as well as into itself.

Applied Bernard's patch:

- copy (menu entry) now works with action window
- deleted/moved directory displays are automatically hidden.
  Actually this one was very easy though I did a lot
  of changes/tests before finding the solution :-)
- files that can't be stat() (i.e. dir is -x) are shown
  with 'noaccess' ownership in full display
- added option not to allow run/copy when object
  dragged to filer (not panels) icons. Some people like
  it the RISC OS way...
- full info alignment of App objects and owner/group
  alignment corrected
- info window: added special info for symlinks, apps
  and mount points
- some bugs and typos corrected