dired should allow plain ls with no -l listings

[Dan Jacobson]

dired-sort-toggle-or-edit with an argument says
     ls switches (must contain -l): -al

"Must contain -l" isn't exactly true. -og will work.
So "must contain -l, o, or g" is more accurate.

But wait, dired should be made to handle just plain ls listings too.
Sometimes one is bored with the boring details, and -og doesn't go far
enough in cleaning them off one's screen.

One can give dired-sort-toggle-or-edit no switches, but then one can't
select files anymore. emacs-version "21.4.1"