Version Control With Subversion Source

* src/en/book/ORPHANED-TOPICS
Lose this -- we cover project layouts and importing in other places.

Update svnbook homepage to show tagged 1.5 version (among other things).

Prime book for 1.6 coverage.

Add en 1.5 placeholder directory.

Tag 1.5 version of the English book (also known "Version Control With
Subversion, second edition", or "ISBN 10: 0-596-51033-0", or "ISBN 13:
9780596510336", or "Pilato's Bane", or ...)

* ru/book/ch-advanced-topics.xml: translation for 'Peg and Operative Revisions' section
* ru/book/ch-customizing-svn.xml: chapter renamed because it had the same name with another chapter

* ru/book/ch-basic-usage.xml: spelling fixes
* ru/book/ch-branching-and-merging.xml: spelling fixes
* ru/book/ch-branching-and-merging.xml: new translation of some paragraphs and spelling fixes

The author of changes is Dmitry Bogomolov (g1itch at i.ua)

* ru/book/ch-advanced-topics.xml: fixes of stylistics

* ru/book/ch-advanced-topics.xml: fixes of stylistics

* src/en/book/ch00-preface.xml,
* src/en/book/ch03-advanced-topics.xml,
* src/en/book/ch05-repository-admin.xml,
* src/en/book/ch01-fundamental-concepts.xml,
* src/en/book/copyright.xml,
* src/en/book/ch06-server-configuration.xml,
* src/en/book/ch04-branching-and-merging.xml,
* src/en/book/ch02-basic-usage.xml,
* src/en/book/ch07-customizing-svn.xml
If we're lucky, our last batch of edits before the second edition
goes to print.

(This includes a couple of tweaks suggested by Alex Purins
<alex.purins {at} businesslink.com>. Thanks, Alex.)