Version Control With Subversion Source

* 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.

* src/en/book/ch02-basic-usage.xml,
* src/en/book/ch03-advanced-topics.xml,
* src/en/book/ch04-branching-and-merging.xml,
* src/en/book/ch06-server-configuration.xml:

Try to consistify our use of long and short options, based on
new HACKING rules.

* src/en/book/ch05-repository-admin.xml
Move the guts of dump-filtering into its own new section, leaving only
a stub description of svndumpfilter in the Administrator's Toolkit
section. Also created a new stub in that section for svnsync.

* src/en/book/styles.css
Hide the "Tip", "Warning", and "Note" titles in their respective
blocks. The icons serve the purpose well enough.

Thank God we aren't using CVS...

* src/en/book/app-quickstart.xml
* src/en/book/app-svn-for-cvs-users.xml
* src/en/book/app-webdav.xml
* src/en/book/app-third-party-tools.xml
* src/en/book/ch-preface.xml
* src/en/book/ch-fundamental-concepts.xml
* src/en/book/ch-basic-usage.xml
* src/en/book/ch-advanced-topics.xml
* src/en/book/ch-branching-and-merging.xml
* src/en/book/ch-repository-admin.xml
* src/en/book/ch-server-configuration.xml
* src/en/book/ch-customizing-svn.xml
* src/en/book/ch-developer-info.xml
Renamed these ...

* src/en/book/appa-quickstart.xml
* src/en/book/appb-svn-for-cvs-users.xml
* src/en/book/appc-webdav.xml
* src/en/book/appd-third-party-tools.xml
* src/en/book/ch00-preface.xml
* src/en/book/ch01-fundamental-concepts.xml
* src/en/book/ch02-basic-usage.xml
* src/en/book/ch03-advanced-topics.xml
* src/en/book/ch04-branching-and-merging.xml
* src/en/book/ch05-repository-admin.xml
* src/en/book/ch06-server-configuration.xml
* src/en/book/ch07-customizing-svn.xml
* src/en/book/ch08-embedding-svn.xml
... to these ...

* src/en/book/book.xml
... and updated the master file.

NOTE: I didn't rename the reference chapter yet, because we've got
additional plans for that sucker.

* src/en/HACKING: add our rules about abbreviating subcommands and options.

* src/en/book/ch-advanced-topics.xml
* src/en/book/ch-basic-usage.xml
Fix some uses of subcommand aliases.

* src/en/book/ch-repository-admin.xml
Add a warning about svndumpfilter literal path interpretation as
requested by Tigris.org user Jeff C <jeffc@...> in Subversion
issue #1853 (http://subversion.tigris.org/issues/show_bug.cgi?id=1853).

* src/en/book/ch-advanced-topics.xml
Add a useful note about externals, partially suggested by Eric Hanchrow
<offby1@...>.