add pref for static articles in s3
static articles pref on pref page
pref setting support for static articles
make_article_printable() added
switch showarticle-print page to call make_article_printable()
add a column to the catalog table for static article url
update_article_static_url() added
get_article_static_url() added
store cartulized articles in S3
re-arrange static file build order