No aliases, back to PATH changes, but different

Don't reorder PATH (an admin might not want that), but prepend PATH with
a directory containing only the shutdown/reboot overrides.
Hack to make it work with our sudo; rel 2, stbr

Previous change made it work in almost all cases except a rather popular
'sudo halt'. Since our sudo enforces a non-overrideable PATH
(--with-sudo-path), the only way for this to work was to put symlinks in
/bin. It ain't pretty, but it works and that's the point of this
package.

Btw: Fedora allows sudo's default behavior of inheriting PATH from
environment. No idea why we do this this way.