Continue the reorganization effort.
* src/en/book/ch-fundamental-concepts.xml,
* src/en/book/ch-basic-usage.xml
Title tweaks.
* src/en/book/ch-guided-tour.xml (deleted)
Renamed to ch-basic-usage.xml.
* src/en/book/ch-basic-concepts.xml (deleted)
Renamed to ch-fundamental-concepts.xml.
* src/en/book/book.xml
Track renamed files.
* src/en/book/ch-advanced-topics.xml
(svn.advanced.confarea svn.advanced.confarea.layout
svn.advanced.confarea.windows-registry svn.advanced.confarea.opts
svn.advanced.confarea.opts.servers, svn.advanced.confarea.opts.config):
Moved to ch-customizing-svn.xml.
(svn.advanced.vendorbr, svn.advanced.vendorbr.general,
svn.advanced.vendorbr.svn_load_dirs): Moved to ch-branching-and-merging.xml.
* src/en/book/ch-customizing-svn.xml
(svn.advanced.confarea svn.advanced.confarea.layout
svn.advanced.confarea.windows-registry svn.advanced.confarea.opts
svn.advanced.confarea.opts.servers, svn.advanced.confarea.opts.config):
Moved from ch-advanced-topics.xml, with a TODO about moving
the reference-y stuff into the Reference chapter.
* src/en/book/ch-branching-and-merging.xml
(svn.advanced.vendorbr, svn.advanced.vendorbr.general,
svn.advanced.vendorbr.svn_load_dirs): Moved from ch-advanced-topics.xml.
