LDEV-3175: Fix incorrect detection of last read-only activity (it must be a System Gate, not just any gate). Fix incorrect transition setting when creating System Gate as the last activity. Fix cascades in Task List tool as cloning content threw exceptions.
LDEV-3171: Give a Monitor an option to remove learner's content from activities when moving him backwards in a sequence. Implementation of content-removing method for most of tools.
LDEV-3164: Support several more tools. Changes in those tools' code TestHarness can interact with them without running Javascript. Remove unnecessary Flash methods. Remove junk from TestHarness project, including zipped Learning Designs which can not be imported anymore as they have non-numeric server version ("beta") Major clean up and logs improvement.