* Here we go back to splitting the document at the Pandoc AST
level, and converting each chapter to HTML separately.
* Fixes bug in footnote processing introduced by
commit 01d109e2ef. The bug caused
all footnotes to appear in the last chapter, so that footnote
links from other chapters would not work. Closes#651.
* We also disable writerTableOfContents, since TOC is automatic
for epub.