Version Control With Subversion Source

Fix the timestamp of the $Id example (thanks, Eric Gillespie).

On the SVNIndexXSLT directive, and viewing HEAD with a web browser.

Alphabetize the URL schemes

Compose Appendix F (what other tools are out there?)

* appd.xml: some tweaks, suggested by jerenkrantz.

Quick skim to change all names we missed to Harry and Sally. Byebye
Joe and Jane.

* doc/book/book/ch02.xml: Name changes
* doc/book/book/ch03.xml: Name changes
* doc/book/book/ch06.xml: Name changes

* ch02.xml: add a sidebar explaining how repositories are accessed
via URLs. This is probably the best place to introduce this, since
1) it's a basic concept, and 2) it's the first time we see a
repository URL in the book.

* appd.xml: fix typo.

* appd.xml (WebDav and Autoversioning): finish this appendix.

It would be Really Swell if jerenkrantz could quickly look over this
chapter. I'd like to make sure I didn't mess up my explanation of
his mod_dav_lock module. :-)

Whoops.

* doc/book/book/appe.xml: Fix Grammar-o.

Make URLs into bona fide systemitems

* doc/book/book/appe.xml: Markup fixup.