dired-copy-file-recursive

[Richard Stallman]

I got this bug report

    dired-do-copy, even though it prompts that it is using cp -p,
    does not preserve ownerships, at least when root, on Debian.
    Real cp -p does. Emacs-version "21.3.1" using  --no-site-file -q.

In some sense, the bug is to say `-p' since the code all assumes that
this feature will preserve only the creation time (which is what it
does).

We could fix it more or less by removing `-p' from the prompt string.
Or we could change the code to preserve owners when root.
Does someone want to work on this?