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/GenericSampler.tpl

@@ -51,8 +51,9 @@ void base_GenericSampler<T,U,K,L>::Run()
     boost::timer::auto_cpu_timer timer;
 
     LOG(INFO) << "Number of events to process: " << fNumEvents;
-    
-    do {
+
+    do
+    {
         for (fCurrentIdx = 0; fCurrentIdx < fNumEvents; fCurrentIdx++)
         {
             for(auto& p : fChannels[fOutChanName])
@@ -75,7 +76,7 @@ void base_GenericSampler<T,U,K,L>::Run()
                 //   boost::this_thread::sleep(boost::posix_time::milliseconds(1));
                 // }
                 
-                if (GetCurrentState() != RUNNING)
+                if (!CheckCurrentState(RUNNING))
                     break;
             }
             // if more than one socket, remove the last incrementation
@@ -83,7 +84,7 @@ void base_GenericSampler<T,U,K,L>::Run()
                     fCurrentIdx--;
         }
     }
-    while ( GetCurrentState() == RUNNING && fContinuous );
+    while (CheckCurrentState(RUNNING) && fContinuous);
 
     boost::timer::cpu_times const elapsed_time(timer.elapsed());
     LOG(INFO) << "Sent everything in:\n" << boost::timer::format(elapsed_time, 2);