Version Control With Subversion Source

* en/book/ch02.xml: Replace a plaintext link with an <xref/>.

Update "1.1" to "1.2" in <subtitle>For Subversion 1.x</subtitle>

* en/book/book.xml: Update.

* en/TODO: New item.

Get the Russians going (again).

* src/ru
New directory for Russian translation, copied from the final
English 1.1 tag.

* src/ru/REVIEW
* src/ru/HACKING
* src/ru/TODO
* src/ru/README
Core out file specific to the English translation.

Book Spanish. Translated two paragraphs. Modified verb in previous
translation.

Update the English webpage.

Tag the 1.1 version of the English book. Go, translators, go.

* src/tools/book-dist.py
(usage): Take an error message instead of an errorcode. Note that
--pdf requires the JAVA_HOME environment variable be set.
(main): Update calls to usage(), and make previous calls to die()
that were related to command-line input use usage() instead.

* src/en/book/ch00.xml
Move the 'New in Subversion 1.1' section closer to the beginning of the
chapter.

* src/en/book/ch07.xml
(Localization): Make edits based on my review of Ben's section addition.

* src/en/TODO
Add a 1.2 TODO item related to string recoding errors.