Dropping edlabel in favour of 'disklabel -i'

[David Brownlee <abs%netbsd.org@localhost>]

Way back before disklabel grew the -i option edlabel provided a
relatively easy way to interactively edit a disklabel.
Now that disklabel does provide -i, (and in fact the usage is easier
than edlabel), would anyone object to dropping edlabel, especially
given that edlabel was only ever built for a subset of ports.