Version Control With Subversion Source

* www/styles.css
(.underline): New class.

* www/old-versions.html
Rework this just a bit for clarity, and move the 1.6 stuff here.

* www/index.en.html
Move 1.6 stuff to old-versions.html, and correct a bunch of outdated
text.

* www/bin/build-and-deploy.conf
Now build the 1.7/en branch for the English 1.7 version. Also,
build only the html-chunk format for nightlies now as that's the
only version that will carry the admonishment about incompleteness.

* www/index.en.html
Add links to the 1.7 versions, and remove links to nightlies save
for the html-chunk version.

Merge from ^/trunk/en r4192 and r4193.

Merge from ^/trunk/en r4202.

* en/book/ch01-fundamental-concepts.xml
Complete a TODO item I'd overlooked -- another limitation of
mixed-revision working copies.

* en/book/book.xml,
* en/book/ch00-preface.xml
Refer to 1.8 as the doc target now, not 1.7.

* en/book/styles.css
* en/stylesheets/custom-html-stylesheet.xsl
Add a custom header that warns readers about the in-between-ness of
this (trunk) version of the book.

Create the English 1.7 maintenance branch.

Create 1.7 version placeholder directory.

Edited wiki page SvnBook17Status through web user interface.