of the reference section, admit some defeat and move httpd.conf
configuration and Subversion property stuffs -- which were never
anything close to "complete reference" quality anyway -- back into the
main portion of the book, leaving the reference material to strictly
cover *commands* (as a Reference is intended to do).
* en/book/book.xml
Drop unnecessary entity references and usages. Lose Part II's
description block.
* en/book/ref-props.xml
Delete this, moving its content...
* en/book/ch03-advanced-topics.xml
...to here.
* en/book/ref-davmodules.xml
Delete this, too, moving its content...
* en/book/ch06-server-configuration.xml
...to here.
* en/book/ch05-repository-admin.xml
* en/book/ref-svn.xml
Cleanup cross-references.
