Version Control With Subversion Source

* doc/book/book/copyright.xml: switch book's license to Creative
Commons "Attribution-ShareAlike" license. (The previous
apache-esque license was specific to software, and made little sense.)

* doc/book/book.xml: add creative-commons blurb to front page, and
finally include the copyright.xml page as appendix E. Remove
inclusion of nonexistent glossary.

* doc/book/book/ch00.xml: the book is no longer under the same
license as Subversion. Add xref to the license appendix.