Added extended interface for CoreNotebookService. Interface extends the ICoreNotebookService and adds getEntry(userID) and getEntry(userID, lessonID).Implemented interface methods.
Implenting copyToolContent. The ToolContent object needs to load the Tool straight away, otherwise the copyToolContent call ends up trying to link a proxied Tool object to two different sessions (the call to actually generate the id is in its own transation).