[Lilypond-auto] Issue 2991 in lilypond: Ensure all level 3 and 4 headings have nodes (2)

[lilypond]

Status: Started
Owner: address@hidden
Labels: Type-Documentation

New issue 2991 by address@hidden: Ensure all level 3 and 4 headings  
have nodes (2)
http://code.google.com/p/lilypond/issues/detail?id=2991


Without them the sections cannot be referenced,
and links in the left panel in html and entries in
the index do not link to the correct section.

Also correct more level 5 headings.

This continues Issue 2967, the fix to which missed
a few changes.