Make sanitize.js more utility-like (move single-page stuff to .html)
Italicize Foreword, Preface and The Author

Acknowledgments is already correct.
Italicize chapter 1
Italicize chapter 2
Italicize chapter 3
Italicize chapter 5

Chapter 4 needs no changes.
Italicize chapter 7

Chapter 6 needs no changes.
Italicize chapter 9

Chapter 8 needs no changes.
Italicize chapter 10
Italicize chapter 11
Add a missing comma
Italicize chapter 12
Italicize chapter 13
Skip note anchors when sanitizing footnotes
Italicize the notes

As in the book, even where it's inconsistent or strange.
Italicize sources
Merge branch 'italicize'

Conflicts:
	ch1.htm
	ch10.htm
	ch11.htm
	ch12.htm
	ch13.htm
	ch9.htm
	notes.htm

This conflicts a lot with the figure rewrites and ellipses, but
it's best to have the italicization based on a clean(er) point.

No unexpected changes were found when comparing the text content
of all modified HTML documents before and after this merge.