Version Control With Subversion Source

* src/en/book/ch08-embedding-svn.xml
Update all uses of options in chapter 8 to match our new guidelines.
(It's a joke. Can't you take a joke?)

* src/en/book/ch05-repository-admin.xml
Fixup option usage in this chapter. While here, touch up the
svnsync-related to point out the it offers many of the same
authentication-related options that svn does, and that the 1.4 version
has the single-auth-creds bug (that I've since fixed in 1.5.0-dev).

Amend the rules for subcommand option descriptions.

* src/en/book/ch08-embedding-svn.xml
Revive a portion of the old Programming With Memory Pools section
from the 1.2 version of the book as a sidebar. (Sorta.)

* src/en/book/ch08-embedding-svn.xml
Commit up changes based on most of Ben's review of Ch 8.

* src/en/book/styles.css
Make <structname> tags look like other fixed-width markup.

* src/en/book/ch05-repository-admin.xml
Finish the last review item from Ben's feedback on chapter 5.

* src/en/book/ch05-repository-admin.xml
More tweaks from Ben's gracious review. (Including the cool row-span
thing in the comparison table he was asking for!)

* src/en/book/styles.css
Stop wasting so much valuable horizontal space on special-block margins.

I've tried four of five different DocBook tweaks to make the reference
chapter into what I'm looking for, all failures. For now, I'll just
rename the thing for consistency with the rest of the book parts.

(And I'll very likely be consulting with O'Reilly's tools team about
what options exist for making this thing work.)

* src/en/book/ch-reference.xml
Renamed to ...

* src/en/book/ch09-reference.xml
... this.

* src/en/book/book.xml
Track the rename.