Finish polishing ZMQ wrapper

castor/messages/TapeserverProxyFactory.hpp

castor/messages/TapeserverProxyZmq.hpp

castor/messages/messages.cpp

castor/messages/messages.hpp

castor/tape/reactor/ZMQPollEventHandler.hpp

castor/tape/reactor/ZMQReactor.cpp

castor/tape/reactor/ZMQReactor.hpp

castor/tape/rmc/AcceptHandler.cpp

castor/tape/rmc/AcceptHandler.hpp

castor/tape/rmc/ConnectionHandler.cpp

castor/tape/rmc/ConnectionHandler.hpp

castor/tape/tapeserver/daemon/AdminAcceptHandler.cpp

castor/tape/tapeserver/daemon/AdminAcceptHandler.hpp

castor/tape/tapeserver/daemon/AdminConnectionHandler.cpp

castor/tape/tapeserver/daemon/AdminConnectionHandler.hpp

castor/tape/tapeserver/daemon/DataTransferSession.hpp

castor/tape/tapeserver/daemon/LabelCmdAcceptHandler.cpp

castor/tape/tapeserver/daemon/LabelCmdAcceptHandler.hpp

castor/tape/tapeserver/daemon/LabelCmdConnectionHandler.cpp

castor/tape/tapeserver/daemon/LabelCmdConnectionHandler.hpp