added senderName() to the Event class. It is needed for handling negative events - sender name, receiver name and timestamp of a negative event must match those values for a positive event.
updated the straggler event class by adding the sender name member variable and senderName() definition
removed the remove queue - not needed till lazy cancellation is implemented.
completed the initialize() and insertEvent() definitions. Partially completed handleAntiMessage() - unprocessed queue type needs to be changed. std::priority_queue does not allow queue traversal - so STLLTSFQueue needs to be replaced with std::multiset or new class is needed.