Version Control With Subversion Source

* tools/Makefile.base-rules
(UNIFIED_XML_TARGET): Refer to the abstracted $(XMLLINT), rather
than "xmllint" explicitly.

* tools/Makefile.base-rules
(EPUB_TARGET): Don't reference our CSS file -- what we do for HTML,
we don't necessarily want to do for eBook. Also, use the -o
option of dbtoepub, and avoid a tempfile rename.

Cleanup what appears to be some sloppiness around the epub-related
build rules.

* tools/Makefile.base-rules
(epub): Depend on $(UNIFIED_XML_TARGET) rather than
book/xml-book.xml explicitly.
(UNIFIED_XML_TARGET): Was book/svn-book.xml explicitly.
(clean): Remove the UNIFIED_XML_TARGET, too.

* tools/Makefile.base-vars
(UNIFIED_XML_TARGET): New.
(ALL_SOURCE): Filter UNIFIED_XML_TARGET, not $(DIR)/svn-book.xml
explicitly.

Fix issue 165, svn mv reference should have a word of warning on WC->WC moves.

* en/book/ch09-reference.xml
(svn.ref.svn.c.move): Document diferences between URL->URL and WC->WC moves.

Patch by: Tero Tilus
(with tweaks from me double-checked by Tero)

Translation "Disabling path-based checks" (ticket #320, cf.
http://www.svnbook.de/ticket/320).

Translation "Per-directory access control" (ticket #320, cf.
http://www.svnbook.de/ticket/320).

Merge r4261 from ^/trunk/en.

Merge r4261 from ^/trunk/en.

* en/book/ch03-advanced-topics.xml
Fix plurality of a verb.

Reported by: nobozo{__AT__}gmail.com (via issue #162)

Style fix.