Version Control With Subversion Source

Name tweak. (This is the guy who wrote "The Railway Series", on which the
whole of Thomas the Tank Engine and his friends are based, by the way.)

* src/en/book/ch03-advanced-topics.xml
(Sparse Directories): Track Subversion change recently made, where
one uses 'svn update --set-depth' instead of 'svn update --depth'
to tweak ambient depth. Also, lose the equal signs (=) in the
demonstrated commandlines -- I can't stand those things.

Oops. Fix a spelling error.

Update my acknowledgments.

* ch04-branching-and-merging.xml: output tweaks from Arfrever Frehtes Taifersar Arahesis <arfrever.fta@...>

Jan. 7, 2008 drop of 1.5 book to O'Reilly.

* src/en/book/ch03-advanced-topics.xml
With much love to Fitz for a good effort, pretty much completely
rewrite the Sparse Directories section.

* src/en/book/ch04-branching-and-merging.xml
Move a tip about how to see the svn:mergeinfo diffs here (from the
Sparse Directories section).

Updated list of assigned tasks.

Update a screen capture of 'svn help import'.

* cho04: fix outdated warning.