Version Control With Subversion Source

Having a public sample repository examples in the book would be good.
Note that the diff output needs to be updated to match the current
diff output style.

* doc/book/book/ch00.xml:
Mention that this book documents version 1.0 of Subversion.
Give some kind words to Windows users that want to follow the
examples in the book after we say we like the Unix environment.

* doc/book/book/ch05.xml
(svn-ch-5-sect-2.2): The term "Berkeley DB environment" is never
defined, so copy its definition from Sleepycat's website.
Fix other minor nits.