LDEV-4196* Adding buttons in monitoring that will recover faulty sessions.* Improved timelimit feature so it opens in the same iframe* Show line numbers option. Etherpad ignores this URL parameter when it's stored in cookie so turned off checking this cookie.
LDEV-4196* Сlose Etherpad session when user finishes activity* Use top level domain for storing cookies* Get rid of the ability of changing user names when editing pads* Remove several extra buttons from Etherpad toolbar. But show timeslider and export html buttons in monitor instead as a separate buttons* Fixed a few previous bugs