Version Control With Subversion Source

* en/book/ch09-reference.xml
Minor wording tweaks.

For Issue 59 ("'svnsync init' supports a --allow-non-empty flag in
Subversion 1.7"):

* en/book/ch09-reference.xml
Note the new 'svnsync initialize --allow-non-empty' option with a
brief description of its utility.

* en/prep-book-for-oreilly
* en/REVIEW
* en/ID-REMAP
Remove some ancient, unused stuff.

Followup to r3991, this time removing the draft-mode setting for the
FO (PDF, PS) output formats, too.

Finish Issue 116 ("1.7 change: 'svn update' prints a header line").

* en/book/ch09-reference.xml
* en/book/ch04-branching-and-merging.xml
Finish (I think) updating 'svn update' example output.

Merge from trunk/en r3999, whose log message read like so:

* en/book/ch03-advanced-topics.xml
Add a note that explains why 'svn update --set-depth exclude'
doesn't look like a regular update.

* en/book/ch03-advanced-topics.xml
Add a note that explains why 'svn update --set-depth exclude'
doesn't look like a regular update.

For Issue 116 ("1.7 change: 'svn update' prints a header line")...

* en/book/ch03-advanced-topics.xml
* en/book/ch01-fundamental-concepts.xml
* en/book/ch02-basic-usage.xml
Begin updating 'update' examples to show the new header line(s).

* branches/1.6/en/book/ch03-advanced-topics.xml
Merge from trunk/en r3996.

* en/book/ch03-advanced-topics.xml
Fix some example output.