Version Control With Subversion Source

* src/en/book/ch00-preface.xml,
* src/en/book/ch01-fundamental-concepts.xml,
* src/en/book/ch02-basic-usage.xml,
* src/en/book/ch03-advanced-topics.xml
Major reworking, mostly of chapter 1, but elsewhere, too. This is
my first pass at implementing fixes for a slew of organizational
grievances I've long held about this text.

Update pre-processing needs.

* src/en/book/ch02-basic-usage.xml
Update, expand, and rework some sections.

* src/en/book/ch05-repository-admin.xml,
* src/en/book/ch04-branching-and-merging.xml
Remove some <firstterm>'s which now appears in Chapter 2.

* src/en/book/ch03-advanced-topics.xml
(svn.advanced.props.special.keywords): Replace tabs with spaces.

* src/en/book/ch03-advanced-topics.xml
(svn.advanced.props.special.keywords): Document the $Header$ keyword.
While here, use example.com in an example URL, instead of using a real URL.
Fixes issue #95.

Patch by: Andreas Stieger <andreas.stieger@...>

Finish issue #76 ("Documentation of historical URI feature").

* src/en/book/ch06-server-configuration.xml
Document the (expanded in 1.6) mod_dav_svn repository browsing
feature.

Patch by: Andreas Stieger <andreas.stieger@...>
(Heavily tweaked by me.)

* src/en/book/ch02-basic-usage.xml
Mention long-form option aliases, and add a couple more index entries.

* src/en/book/ch01-fundamental-concepts.xml
Oops, fix the secondary indexterm for some subcommands to merge into
other similar terms as intended.

* src/en/book/ch03-advanced-topics.xml
* src/en/book/ch01-fundamental-concepts.xml
* src/en/book/ch00-preface.xml
Mostly index entry additions. Some minor wording and formatting changes.

Bump the copyright, the sequel.