The internal configuration structure has been changed:
1. instead of creating a new conf (unnecessarily) the one parsed from json is simply extended
2. a new array is created for the book on the 'pure' list of chapters, instead of the structured one that the original configuration may contain.

This version reproduces the functionality of the previous one, ie, flag chapter lists are processed o.k.; the toc
The package's nav generator method is now prepared for the new structure.

The module has _not_ been tested on the new structure yet, but the old functionality has been faithfully reproduced.
The first tests go through now (a more complex test will follow later), and the new TOC feature is also documented
Removed the “do not generate toc file option”. It becomes unnecessary with the extended toc feature.
Complex TOC has been tested with RDF1.1 (that uses it big time). This branch is ready to be merged back into the main branch…