Version Control With Subversion Source

* en/book/ref-svnadmin.xml
In the `svnadmin` command line reference, mentioned that `svnadmin load` now
accepts `--revision` option.
- http://subversion.apache.org/docs/release-notes/1.8.html#svnadmin-load
- http://subversion.tigris.org/issues/show_bug.cgi?id=3734

Patch by: pavel.lyalyakin{_AT_}visualsvn.com

* en/book/ref-svnadmin.xml
Add `svnadmin freeze` subcommand to `svnadmin` command line reference.
- http://subversion.apache.org/docs/release-notes/1.8.html#svnadmin-freeze
- http://svn.apache.org/viewvc?view=revision&revision=1376228

Patch by: pavel.lyalyakin{_AT_}visualsvn.com

* en/book/ch06-server-configuration.xml
Document mod_dav_svn's 1.8 keyword expansion feature.

Patch by: Pavel Lyalyakin <pavel.lyalyakin{__AT__}visualsvn.com>
(Tweaked by me.)

* en/book/ref-svn.xml
Fix a weird rendering issue that causes option descriptions to break
across lines.

Patch by: Pavel Lyalyakin <pavel.lyalyakin{__AT__}visualsvn.com>
(Tweaked by me.)

Removed article.

[de] Synced with updated English version.

[de] Added --search and --search-and option description.

[de] Changed "übergeben" to "übertragen" to concur with Subversions
German locale output.

Fix issue 228: Dubious "svn merge" output. Reported by gan.ainm.riomhphost.

* en/book/ch04-branching-and-merging.xml
Fix the output of a 2-URL 'svn merge'.

Reword the description of 'svnadmin lock'.