Reference into a bunch of smaller focused references.
* en/book/book.xml
Add character entities for the new reference sections, and break the
book up into distinct <part>s.
* en/book/styles.css
Stylistic tweaks for TOCs.
* en/book/ch09-reference.xml
Delete this, but divide its contents up into ...
* en/book/ref-davmodules.xml,
* en/book/ref-props.xml,
* en/book/ref-reposhooks.xml,
* en/book/ref-svn.xml,
* en/book/ref-svnadmin.xml,
* en/book/ref-svndumpfilter.xml,
* en/book/ref-svnlook.xml,
* en/book/ref-svnmucc.xml,
* en/book/ref-svnrdump.xml,
* en/book/ref-svnserve.xml,
* en/book/ref-svnsync.xml,
* en/book/ref-svnversion.xml
... all of these smaller, more focused <reference> files.
