Version Control With Subversion Source

Thanks for feedback from Robert P. J. Day <rpjday@...> and
Martin Furter <mf@...>.

* ch05.xml: document the conf/ directory in a newly created repos.
* ch09.xml: fix typo in 'svnlook history' example.
* ch06.xml: show mod_dav being loaded in httpd.conf examples.
* foreword.xml: credit Karl Fogel.