Fix warnings produced with -Weffc++ in fairmq, base/MQ and Tutorial3.

Remaining warnings originate from boost::msm and boost::mpl.
Also, warnings with missing initializer list entries for DeviceOptions are false positives, since those are PODs.

fairmq/prototest/FairMQProtoSampler.cxx

@@ -65,7 +65,7 @@ void FairMQProtoSampler::Run()
             // LOG(INFO) << content->x() << " " << content->y() << " " << content->z() << " " << content->a() << " " << content->b();
         }
 
-        std::string str;
+        string str;
         p.SerializeToString(&str);
         size_t size = str.length();
 

fairmq/prototest/FairMQProtoSampler.h

@@ -19,6 +19,8 @@
 
 #include "FairMQDevice.h"
 
+using namespace std;
+
 class FairMQProtoSampler : public FairMQDevice
 {
   public: