backup-files: New function for copy

We are abusing backup-files's "backup" function for quilt snapshot.
What we need is semantically different, and it works almost by
accident. We don't want linked copies of the files, we want real
copies, and the fact that "quilt snapshot" may touch the working
files is a little frightening IMHO.

So, implement a separate "copy" function which does what we need. Not
only it does the right thing, but it will also be somewhat faster
than "backup", as we can do straight copies of the files without
checking for their link count first.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Reviewed-by: Raphael Hertzog <hertzog@debian.org>

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