Fixes 93afab1e which was supposed to do that but I apparently backed it
out before committing.
All pages now behave like the index, with the Odoo logo removed from the
sidebar and set next to the current page's title.
* by-application (odoo-wise) grouping
* use part of the accounting TOC defined on pad
* support for "internal" tocs & fixup front toc
* various changes and improvements to extensions
May be missing: inherited document banners?
