Version Control With Subversion Source

Tighten up a cross-reference.

Note that the externals definition syntax also includes optional revision
flags.

Fill in a ### BLAH BLAH BLAH bit.

* www/index.en.html
Make the author names link to their personal websites...

* www/styles.css
...but don't make a big deal about it.

* src/en/book/ch-repository-admin.xml
More hammerin' and sawin' on yet another massive chapter.

* src/en/book/ORPHANED-TOPICS
Created as a temporary holding area for a topic that I dunno where to
put (though /dev/null is looking right nice).

* src/en/book/app-webdav.xml
* src/en/book/ch-fundamental-concepts.xml
* src/en/book/ch-server-configuration.xml
* src/en/book/ch-customizing-svn.xml
* src/en/book/ch-branching-and-merging.xml
* src/en/book/ch-basic-usage.xml
Add some sect3 visual divider line cues, and fix some indentation issues
I noticed along the way.

* src/en/book/ch-repository-admin.xml
* src/en/book/ch-server-configuration.xml
* src/en/book/ch-developer-info.xml
Commit up some stuff I did on the plane back from San Francisco. I
don't really remember the details.

* ru/book/ch-reference.xml: Description of 'svn delete' command has been translated.

* src/en/book/ch-developer-info.xml
Overhaul this chapter. (Note quite complete... need to decide what to do
with the WebDAV section.)

* src/en/book/ch-fundamental-concepts.xml
Move a URL-related warning into the URL section.

* src/en/book/ch-reference.xml
Add some missing refpurpose's. Tweak the properties section to not be
trying (and failing) to be reference-y.

* src/en/book/ch-advanced-topics.xml
Update some cross-references.