a stack of directories, we'll do with a save/restore_dirs cludge for
now. => Fixes the bug I mentioned yesterday that shows when one pkg
installs another (depending) pkg via FTP.
Fixed another bug with extract-in-place when the destination dir is
already there.
Un-munge pkg_install/lib/Makefile which I'd overwritten on libftpio commit.
Make it compile on NetBSD.
Install pkg_* programs in /usr/sbin
XXX agc - Still to do XXX
Cleanup call to mktemp (for a tmp dir) in pkg_install/lib/pen.c
Create ftperr.c in the correct directory.