Replacing sade with bsdinstall's partedit

[Nathan Whitehorn]

I was wondering how people would feel about replacing sade in -CURRENT 
with the partition editor utility from bsdinstall. It provides similar 
functionality to sade, but with the addition of supporting GPT, working 
on non-x86 platforms, etc. It would also keep things more in sync with 
the installer.

If you want to test it, the following will work on either -CURRENT or 9.0:
rm /usr/sbin/sade
ln -s /usr/libexec/bsdinstall/partedit /usr/sbin/sade
-Nathan