Version Control With Subversion Source

Begin the work of reorganization book sections based on our
agreed-upon outline.

* src/en/book/ch-introduction.xml
(svn.intro.whatis, svn.intro.history, svn.intro.features,
svn.intro.architecture): Move to ch-preface.xml.

* src/en/book/ch-preface.xml
(svn.intro.whatis) Moved from ch-introduction.xml as a new sect1.
(svn.intro.history, svn.intro.features, svn.intro.architecture):
Moved from ch-introduction.xml as sect2's under svn.intro.whatis.
(svn.components): New placeholder section.