Version Control With Subversion Source

* tools/bin/spew-svn-command-options
Add 'svnauth' and 'svnmucc' to the list of programs whose options
are listed.

Bump copyright years.

For issue #234 (1.8 change: The Berkeley DB-based repository back-end
has been deprecated), move most of the Berkeley DB-specific
information to a new Appendix D and purge the book of the implication
that choosing a repository backend is really a thing.

* en/book/appd-berkeley-db.xml
New appendix, primarily populated with material culled from...

* en/book/ch05-repository-admin.xml
...this chapter, which now clearly favors FSFS.

* en/book/book.xml
Hook up the new appendix.

* en/book/ch03-advanced-topics.xml
* en/book/ref-svnadmin.xml
Update some cross references.

* en/book/ch06-server-configuration.xml
(svn.serverconfig.svnserve.ref): A new section which offers a
reference of svnserve configuration options, much like the existing
sections which describe mod_dav_svn and mod_authz_svn configuration
directives.

Merge from ^/trunk/en r5082.

* en/book/ref-svnserve.xml
(svn.ref.svnserve.sw.prefer_ipv6): Fix a missing ')'.

* en/book/ch06-server-configuration.xml
For issue #258 (1.8 change: Hook script environment variables are
now configurable), document the SVNHooksEnv Apache configuration
directive.

* en/book/ch02-basic-usage.xml
Further tweak the conflict-resolution-related index term definitions
to combine the 'conflicts/resolving' and 'conflicts/resolution'
spaces.

* en/book/ref-svn.xml
Oops! Fix some typos ("&rt;" -> ">").

This fixes issue #259 (1.8 change: `svn info` now shows
repository-relative URLs).

Some examples specifically grep for "URL". Most of those now grep for
"^URL" so as not to distract from the larger point of those examples
with the additional "Relative URL" output line.

* en/book/ch03-advanced-topics.xml
* en/book/ch04-branching-and-merging.xml
* en/book/ref-svn.xml
Update uses of 'svn info' to consider the "Relative URL" output line.