Version Control With Subversion Source

Copyedits for the rest of Chapter 9.

* src/en/book/ch06-server-configuration.xml: Title tweak.
* src/en/book/ch09-reference.xml: Finish chapter copyedits.

* ch06-server-configuration.xml: copyedit checkpoint.

Copyedits for approximately 1/3 of chapter 9.

* src/en/book/ch09-reference.xml: Copyedits for svn command line client

Undo r3042 as I misunderstood the copy editor. Nothing to see here, please move along.

* src/en/book/ch02-basic-usage.xml: Un-tweak option formatting.

Undo r3043 as I misunderstood the copy editor. Nothing to see here, please move along.

* src/en/HACKING: Florp.

* ch06-server-configuration.xml: more copyedits. more to come.

Update our style guide to reflect the wishes of the O'Reilly
copyeditors (and besides, it makes the markeup a *little* easier to
read.

* src/en/HACKING: Fixey.

More copyedits for Chapter 2.

* src/en/book/ch02-basic-usage.xml: Tweak option formatting.

Copyedits for Chapter 2.

* src/en/book/ch02-basic-usage.xml: Death by a thousand cuts.

* src/en/book/ch04-branching-and-merging.xml
(Changesets): Use the standard "rN" syntax for revision numbers.
(Keeping a Branch in Sync): Don't change verb subject in mid-sentence.
Say "these changes", not "your changes", because the changes in
question were by someone else and only merged to "your" branch.
Add an extra update step in example, to emphasize the point.
Clarify some things by introducing the term "line of development".
(Mergeinfo and Previews): Don't claim we saw 'svn mergeinfo'
earlier, since this is actually the first mention of it.