merge xcoulon's changes into mine
remove marketplace and update_site URLs for JBT 4.1.0.Final; move them to JBT 4.1.1.Final; fix link to JBT 4.1.1 blog
fix link to Jenkins view - s/Trunk/Master/g
rephrase labels on update site zip page & update site page; fix links and versions; add variables for whatsnew_url, release_notes_url, blog_announcement_url; add links to Doc for JBT/JBDS