Several FairMQ fixes and improvements:

- FairMQ: add possibility to poll on multiple channels.
- FairMQ: include command channel when polling on blocking calls (for unblocking without termination).
- FairMQ: move signal handler inside of FairMQDevice class (call FairMQDevice::CatchSignals() in the main function).
- FairMQ: add 'bool CheckCurrentState(statename)' (instead of 'GetCurrentState() == statename' that cannot be thread safe).
- FairMQDevice: add 'InteractiveStateLoop()' method that can be used to change states from the command line.
- FairMQDevice: add automatic transition to IDLE state if Run() exits without an external event.
- FairMQDevice: implement device reset.
- FairMQDevice: use unordered_map for device channels.
- FairMQChannel: improve address validation for channels.
- FairMQChannel: add ExpectsAnotherPart() method to check if another msg part is expected (old approach still works).
- FairMQ: remove invalid transition from the run files.
- FairMQFileSink: disable ROOT termination signal handler.
- Tutorial3: spawn xterm windows from start scripts without overlapping for better visibility.
- FairMQ Examples: update protobuf test and move its files to a common directory.
- FairMQStateMachine: improve feedback on invalid transitions (more readable).

fairmq/devices/GenericProcessor.h

@@ -92,10 +92,7 @@ class GenericProcessor : public FairMQDevice, public InputPolicy, public OutputP
     // bool ReceivePart();
     bool ReceivePart()
     {
-        int64_t more = 0;
-        size_t more_size = sizeof(more);
-        fChannels["data-in"].at(0).fSocket->GetOption("rcv-more", &more, &more_size);
-        if (more)
+        if (fChannels["data-in"].at(0).ExpectsAnotherPart())
         {
             InputPolicy::CloseMessage(); 
             // fProcessorTask->GetPayload()->CloseMessage();
@@ -123,7 +120,7 @@ class GenericProcessor : public FairMQDevice, public InputPolicy, public OutputP
         int receivedMsgs = 0;
         int sentMsgs = 0;
 
-        while (GetCurrentState() == RUNNING)
+        while (CheckCurrentState(RUNNING))
         {
             FairMQMessage* msg = fTransportFactory->CreateMessage();