This encapsulates more in the id and section handling code. Fixes a few
edge cases and separates implementation of the new and old section
handling code. Always normalizes and truncates generated ids in quickbook
1.6.
[SVN r75251]
If an included file has a docinfo block, use that docinfo. I'm not
entirely sure if the nested file be treated as if it's completely
standalone - i.e. should macros and templates defined in the parent be
used?
Also, there's some odd behaviour in quickbook if the docinfo block in an
included file has a parse error. It just goes back to the start and
parses as a file without a docinfo block. I think it would be better if
this was a hard error, but what should happen in someone has defined a
template with the same name as a docinfo block? That's actually valid in
existing quickbook, so the dodgy docinfo block might just be a template
call.
[SVN r70963]
