news: lilypondblog moved to new domain
Announces the LilyPond Blog in pondings.
Issue 3422: Changing EventChord to NoteEvent in scheme-tutorial.itely

Signed-off-by: David Kastrup <dak@gnu.org>
Updates to NR chapter 2
Fix Janek's e-mail in Ponding.
Release: bump VERSION_DEVEL.
PO: update template.
Release: update news.
Release: bump VERSION.