It used to be that if you typed "mv foo foo" and foo was a directory, you
would get an error. Now it recursively copies the contents of foo into
foo/foo! This is very frustrating; one of the common cases where this
bites me is that I have a directory full of files with a prefix of "foo", I
create a directory simply called foo, and then want to do "mv foo* foo".
With previous versions of the fileutils, I would get an error saying that
the directory foo/ could not be moved into itself, and that's fine; it
would still move the rest of the files. But now something bad happens with
respect to the directory foo itself.
