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* Enforce proper ordering of heading levels: specifically, ensure theSimon Tatham2001-10-25
user doesn't skip a heading level (\H before any \C or \A, or \S straight after \C with no intervening \H). The precise criterion is that when creating section a.b.c.d, sections a.b.c, a.b and a should already exist. This ensures the section tree really is a properly formed tree with no missing nodes. [originally from svn r1329]