Version Control With Subversion Source

Remove a little stray CDATA causing validation failures.

Translation status update.

* ru/book/ch-reference.xml: A command description meaning has been clarified.

* src/en/book/ch-preface.xml
Fill in the boilerplate how-to-give-feedback stuff.

* src/en/TODO
Remove item.

* src/ru/book/ch-advanced-topics.xml
src/ru/book/ch-basic-usage.xml
src/ru/book/ch-fundamental-concepts.xml
src/ru/book/ch-preface.xml
Sync with src/en/book up to r2606, translate newly added paras, and stop syncing for a while.

* src/ru/book/*
Remove property 'last-sync', and set this property on 'book' directory,
globally for all files.

* src/ru/sync.py: move from per-file syncing to syncing all-files-at-once.

* src/ru/TRANSLATION-STATUS: update status of translation.

Delete branch since I'm done with it

Merge fitz-ripping-up-ch-02 branch back to trunk.

* book/ch-reference.xml, book/ch-advanced-topics.xml,
book/ch-repository-admin.xml, book/app-svn-for-cvs-users.xml,
book/app-quickstart.xml, book/ch-basic-usage.xml: Merge, of course.

Chapter 2 now ready for review.

* src/en/book/ch-basic-usage.xml: Refine.

* src/en/book/ch-advanced-topics.xml: Tweak a weird title.

A number of improvements to chapter 4.

* src/en/book/ch-branching-and-merging.xml:

- a bunch of misc cleanups/rewordings
- don't mention CVS attic junk
- don't mention the specific command 'svn obliterate', keep it vague
- mention pegrev syntax where we can
- don't talk about svn 1.0, that's so 2004.
- add new section warning about problems with merging moves/copies