Version Control With Subversion Source

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.