A moderatly busy cycle for development this time around.

- Some cleanup of the main index page for easier navigation

- Rework some of the other top-level pages for better readability and, with
  luck, fewer merge conflicts in the future.

- Submit-checklist improvements, hopefully the first of many.

- New Italian translations

- A fair number of kernel-doc fixes and improvements.  We have also dropped
  the recommendation to use an old version of Sphinx.

- A new document from Thorsten on bisection

...and lots of fixes and updates.
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