Book: Add emacs local variables section which disappeared.
Book: Add emacs local variables section which disappeared.

* doc/book/book/ch03.xml: Emacs goodness, no content changes.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion