Version Control With Subversion Source

* src/en/book/appa.xml,
* src/en/book/appb.xml,
* src/en/book/ch04.xml,
* src/en/book/ch06.xml,
* src/en/book/ch07.xml,
* src/en/book/ch08.xml
Fix places where > should be >, " to <quote>, and to remove space
around —. Also, use <guimenu> and <guimenuitem> tags where
appropriate.