Simplified things by including books.xslt, download.xslt and security.xslt into article.xslt, and always using article.xslt to generate HTMLs. While here, moved versions.xml from common dependencies to article dependencies. Fixed menu in 404.html by applying templates from menu.xslt, and fixed its dependency on DTD.

#!/bin/sh

umask 002

exec /bin/sh "$@"