Version Control With Subversion Source

Finish issue #125 ("1.6 change: svn status output (new 7th column)").

* src/en/book/appb-svn-for-cvs-users.xml,
* src/en/book/ch02-basic-usage.xml,
* src/en/book/ch03-advanced-topics.xml,
* src/en/book/ch04-branching-and-merging.xml,
* src/en/book/ch09-reference.xml
Update all 'svn status' examples to include the seventh column added
in Subversion 1.6 to carry tree conflict information.

* src/tools/bin/spew-svn-command-options
Teach this thing how to deal with binaries such as 'svnversion' and
'svnserve' that don't have subcommands but do offer the --help
option.

* src/en/book/ch01-fundamental-concepts.xml
Wrap all examples in <informalexample>...</informalexample>. Remove
<screen>...</screen> wrappers from an example that doesn't show
screen output.

trunk/src/de/book/ch01-fundamental-concepts.xml:
* Closes ticket #13 (cf. http://www.svnbook.de/ticket/13).

trunk/src/de/book/ch01-fundamental-concepts.xml:
* Closes ticket #13 (cf. http://www.svnbook.de/ticket/13).

trunk/src/de/book/ch03-advanced-topics.xml:
* Closes ticket #142 (cf. http://www.svnbook.de/ticket/142).

trunk/src/de/book/ch03-advanced-topics.xml:
* Client Credentials Caching: completes task #141 (cf. http://www.svnbook.de/ticket/141)

Similarly tweak SvnBook17Status per r3856.

Edited wiki page SvnBook16Status through web user interface.

* src/en/book/ch01-fundamental-concepts.xml
(svn.advanced.reposurls): Rework this to avoid showing actual 'svn'
commandlines.

* src/en/book/styles.css
Treat informal examples similarly to regular examples.