Version Control With Subversion Source

Add Matteo Tontini as an Italian translator.

* ch06: Begin documenting SASL feature for svnserve.

Finish trac issue #54.

* src/en/book/ch00-preface.xml
(Is Subversion the Right Tool?): new section.

* src/en/book/ch09-reference.xml
(svn.ref.svn.sw): Move the '--no-diff-added' flag from here...
(svn.ref.svnlook.sw): ...to here, where it belongs.
Also, clarify that companion flag '--no-diff-deleted' applies only
to the 'svnlook diff' subcommand.

* src/en/book/ch04-branching-and-merging.xml
Fix a couple of typos. Patch by David Alber <David_Alber@...>.

* www/old-versions.html: Note that there is no 1.3 version of the book.

Fix some shortcomings in the 'svnlook' reference matter.

* src/en/book/ch09-reference.xml
(svn.ref.svnlook.c.info): Note that the size of the log message is expressed
in bytes, and that the log message is always followed by a newline. Fix
the example to actually show the correct log size. (Doh!)
(svn.ref.svnlook.c.log): Note that the log message is always followed by a
newline.

Suggested by: Vincent Lefevre <vincent+svn@...>

* src/en/book/ch09-reference.xml
(svn.ref.svn.c.cat): Add "-r HEAD" flag to make tip correct.

Found by: Arthur Kowalczyk <arthur_kowalczyk{_AT_}yahoo.co.uk>

Teach make-ad-sense.py to add Google analytics bugs, too.

* src/it/book/ch09.xml
(svn.ref.svn.c.commit): Fix validation error.