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-3070: Fix few minor errors in Tools. Pass notifyCloseURL to proper authoring page in some Tools.Make generation of Tool content a non read-only operation as it starts a database transaction which is later used for writing.
LDEV-2737: Change Tools' web.xml files to comply with LAMS 2.4 Tool Application Context discovery mechanism.Add missing abstract methods implementation.Remove several libraries as they interfere with endorsed XML libraries on JBoss 5.