Version Control With Subversion Source

My trivial and minor comments and changes to the book. Any issues
with the book that I didn't want to change myself I placed into the
REVIEW file.

* doc/book/REVIEW: New file contain book reviews and comments.

* doc/book/book/ch03.xml:
Use the word "copy" instead of "move" when files are imported into a
working copy, since the import doesn't delete the original file,
which the word "move" may imply.

* doc/book/book/ch04.xml:
Add a \ for a sample command to get line wrapping correct.

* doc/book/book/ch05.xml,
Spell out what ACL means.
Add deltify to the 'svnadmin help' output.
For the safe way to backup a repository, mention 'svnadmin hotcopy'
instead of copying and recopying the repository.
Put ""'s around variable names in the txn-info.sh sample script, as
all our shell scripts do.
Update 'svnadmin recover' output to match current behavior.

* doc/book/book/ch06.xml:
(Server Configuration): Mention that the file:// method is used to
access the repository on a local filesystem.
Use the -m command line option to htpasswd to use MD5 encryption of
the passwords instead of crypt(), which isn't as secure.
Make sure that all paths to the Apache passwd file are consistent.

* doc/book/book/ch07.xml:
To be consistent with the rest of the book where file extensions are
mentioned, s/\.REG/.reg/g.

* doc/book/book/ch09.xml:
Remove a stutter.

Book tweaks.

* ch05.xml: fix final paragraph to not mention apache.

* ch06.xml: mention the "user = " option in the accessfile.

* ch06.xml: Grammar fixes.

* doc/book/book/ch06.xml: Removed duplicated word.

* ch06.xml: Spelling fixes, courtesy of ispell-buffer.

* doc/book/book/ch06.xml

Remove a word that felt out of place...

* ch06.xml: oops, fix duplicated section number.

Finish "new" chapter 6 in book.

* ch06.xml: document SSL certificate features, and all of mod_authz_svn.

* ch06.xml: continue book work.