Fix typos in chapter 11
Dashify chapter 11
Fix the HTML for the front cover

http://blog.threepress.org/2009/11/20/best-practices-in-epub-cover-images/
Try to please the EPUB validator
Fix the markup/style of the footnotes (*)

Made the IDs globally unique to allow merging.
Removed <SUP> since an asterisk is already raised.
Moved <HR> to before <P>, since it otherwise closes it.