books: reading order and presentation issues for front-matter-ish content

[pkra]

As discussed recently, we have aggregated several small problems related to the reading order (of books) over the years.

I think this stems from the conflict of content needing to be presented in a particular way but being stored either (only) as metadata or out of the main content flow. Examples include CIP page, titlepage, series-specific pages, abstracts. Downstream needs to generate or integrate these with other content currently generated in front-matter (publisher's note, dedication, toc, preface).

If we want to resolve the recurring issues we have had in this area, some information in the XML about the correct order would simplify this greatly. I suspect, in the long run, it will be more robust to generate all content that needs to be presented, even if it seemingly duplicates metadata (esp. where we had cases where print presentation differs from metadata).

[pkra]

I had forgotten about this one when creating #269