Enable new callback API

- OnData() channel data handler.
 - ConditionalRun() for devices without incoming data.
 - Header file with common main(), to be extended with getDevice/addCustomOptions.
 - Update examples (MQ/Tutorial3) to use the new API and config.
 - NewSimpleMessage() for simpler creation of small messages (additional copy).
 - Replace SetProperty/GetProperty with fConfig access.
 - Runtime configurable channel names for common devices.
 - Configurable logging interval per channel.
 - FairMQMultiplier for distributing same data to multiple outputs.
 - Cleanup state machine messages.
 - Cmd option to toggle signal handling.
 - Simpler API for send/receive timeouts.
 - Enable --log-to-file.
 - Fix coverity issues, warnings.
 - Various code cleanup and minor tweaks.

fairmq/zeromq/FairMQSocketZMQ.h

@@ -17,7 +17,7 @@
 
 #include <atomic>
 
-#include <boost/shared_ptr.hpp>
+#include <memory> // unique_ptr
 
 #include "FairMQSocket.h"
 #include "FairMQContextZMQ.h"
@@ -72,7 +72,7 @@ class FairMQSocketZMQ : public FairMQSocket
     std::atomic<unsigned long> fMessagesTx;
     std::atomic<unsigned long> fMessagesRx;
 
-    static boost::shared_ptr<FairMQContextZMQ> fContext;
+    static std::unique_ptr<FairMQContextZMQ> fContext;
 };
 
 #endif /* FAIRMQSOCKETZMQ_H_ */