Version Control With Subversion Source

repositories, eg:

- /usr/local/svn
- /usr/local/repositories
- /repos
- /tmp/repos
- /path/to/repos

And distill them all down into

- /var/svn

This not only fixes issue #34, but also appeals to my obsessive
compulsive nature. Life is good.

* src/en/book/ch01-fundamental-concepts.xml,
src/en/book/ch02-basic-usage.xml
src/en/book/ch03-advanced-topics.xml,
src/en/book/ch05-repository-admin.xml,
src/en/book/ch06-server-configuration.xml,
src/en/book/ch09-reference.xml,
src/en/book/appa-quickstart.xml,
src/en/book/appc-webdav.xml: Consistify.