Wipe out most of the obsoleted (2.2-related) changelist from the
relnotes, and add those stuff that came to mind being really new
in 3.0.
Folks, if you add some major feature in -current, please consider
recording it here. Our users love to know what they're getting by
reading it in a single file. In particular, the Lite2 mergers might
consider adding information here.