LDEV-1912 set session timeout programmatically according to lams' UserInactiveTimeout value via a servlet listener rather than hard coding to 120 mins (in some webapps, no session timeout was specified at all).
LDEV-1005: Added lesson name to headings, added help button, improved layout, improved browser compatibility on the page sizing, added scrolling to the iframe, hide the branches that the user isn't doing, adding support for the jump ahead in preview.