'cp' now uses openat etc. when copying to directories

[Paul Eggert]

I installed the attached so that GNU 'cp' now uses directory-relative 
syscalls like 'openat', 'mkdirat' and 'chmodat' when the target is a 
directory. The idea is to make it easier to modify 'cp' in the future so 
that it can use xfts for recursive copies.

Even without xfts this should be a win, for uses of 'cp' to a directory, 
as it should be a bit faster and should avoid some race conditions. 
However, there are a lot of glitchy little things in this patch so I'm 
sending this heads-up as a warning that I may have introduced a bug.

You'll also need to run ./bootstrap after doing a git pull, since some 
of the Gnulib changes are needed for this.

0001-cp-when-copying-to-dir-use-dir-relative-names.patch
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