Updates:
Labels: -Patch-countdown Patch-new
Comment #16 on issue 1650 by [email protected]: using multiple \header in a
block prints only the latest items
http://code.google.com/p/lilypond/issues/detail?id=1650#c16
Issue 1650: merge multiple header specifications.
Books get initialized from $defaultheader, this is what toplevel \header
will set, and scores and bookparts are initialized empty so that they will
end up combined with their respective (possibly implicit) books.
http://codereview.appspot.com/6445053
