Fix compiler warnings.

Initialize all data members in initializer lists.
Reorder data members in initializer list to have the same order as in the class declaration.
Comment or remove unused parameters and unused variables.
Convert all old style casts to the correct and explicit c++ cast like const_cast, static_cast,
dynamic_cast or reinterpret_cast. In most cases static_cast is used.

examples/MQ/1-sampler-sink/FairMQExample1Sampler.cxx

@@ -26,9 +26,9 @@ FairMQExample1Sampler::FairMQExample1Sampler()
 {
 }
 
-void FairMQExample1Sampler::CustomCleanup(void *data, void *object)
+void FairMQExample1Sampler::CustomCleanup(void* /*data*/, void *object)
 {
-    delete (string*)object;
+    delete static_cast<string*>(object);
 }
 
 void FairMQExample1Sampler::Run()

examples/MQ/2-sampler-processor-sink/FairMQExample2Processor.cxx

@@ -25,9 +25,9 @@ FairMQExample2Processor::FairMQExample2Processor()
 {
 }
 
-void FairMQExample2Processor::CustomCleanup(void *data, void *object)
+void FairMQExample2Processor::CustomCleanup(void* /*data*/, void *object)
 {
-    delete (string*)object;
+    delete static_cast<string*>(object);
 }
 
 void FairMQExample2Processor::Run()

examples/MQ/2-sampler-processor-sink/FairMQExample2Sampler.cxx

@@ -25,9 +25,9 @@ FairMQExample2Sampler::FairMQExample2Sampler()
 {
 }
 
-void FairMQExample2Sampler::CustomCleanup(void *data, void *object)
+void FairMQExample2Sampler::CustomCleanup(void* /*data*/, void *object)
 {
-    delete (string*)object;
+    delete static_cast<string*>(object);
 }
 
 void FairMQExample2Sampler::Run()

examples/MQ/3-dds/FairMQExample3Processor.cxx

@@ -26,7 +26,7 @@ FairMQExample3Processor::FairMQExample3Processor()
 
 void FairMQExample3Processor::CustomCleanup(void *data, void *object)
 {
-    delete (string*)object;
+    delete static_cast<string*>(object);
 }
 
 void FairMQExample3Processor::Run()

examples/MQ/3-dds/FairMQExample3Sampler.cxx

@@ -26,7 +26,7 @@ FairMQExample3Sampler::FairMQExample3Sampler()
 
 void FairMQExample3Sampler::CustomCleanup(void *data, void *object)
 {
-    delete (string*)object;
+    delete static_cast<string*>(object);
 }
 
 void FairMQExample3Sampler::Run()

examples/MQ/3-dds/runDDSCommandUI.cxx

@@ -41,4 +41,4 @@ int main(int argc, char* argv[])
     }
 
     return EXIT_SUCCESS;
-}
+}

examples/MQ/4-copypush/FairMQExample4Sampler.cxx

@@ -40,7 +40,7 @@ void FairMQExample4Sampler::Run()
 
         if (fChannels.at("data").size() > 1)
         {
-            for (int i = 1; i < fChannels.at("data").size(); ++i)
+            for (unsigned int i = 1; i < fChannels.at("data").size(); ++i)
             {
                 std::unique_ptr<FairMQMessage> msgCopy(NewMessage());
                 msgCopy->Copy(msg);

examples/MQ/5-req-rep/FairMQExample5Client.cxx

@@ -29,9 +29,9 @@ FairMQExample5Client::~FairMQExample5Client()
 {
 }
 
-void FairMQExample5Client::CustomCleanup(void *data, void *hint)
+void FairMQExample5Client::CustomCleanup(void* /*data*/, void *hint)
 {
-    delete (string*)hint;
+    delete static_cast<string*>(hint);
 }
 
 void FairMQExample5Client::Run()

examples/MQ/5-req-rep/FairMQExample5Server.cxx

@@ -24,9 +24,9 @@ FairMQExample5Server::FairMQExample5Server()
 {
 }
 
-void FairMQExample5Server::CustomCleanup(void *data, void *hint)
+void FairMQExample5Server::CustomCleanup(void* /*data*/, void *hint)
 {
-    delete (string*)hint;
+    delete static_cast<string*>(hint);
 }
 
 void FairMQExample5Server::Run()

examples/MQ/6-multiple-channels/FairMQExample6Broadcaster.cxx

@@ -26,9 +26,9 @@ FairMQExample6Broadcaster::FairMQExample6Broadcaster()
 {
 }
 
-void FairMQExample6Broadcaster::CustomCleanup(void *data, void *object)
+void FairMQExample6Broadcaster::CustomCleanup(void* /*data*/, void *object)
 {
-    delete (string*)object;
+    delete static_cast<string*>(object);
 }
 
 void FairMQExample6Broadcaster::Run()

examples/MQ/6-multiple-channels/FairMQExample6Sampler.cxx

@@ -27,9 +27,9 @@ FairMQExample6Sampler::FairMQExample6Sampler()
 {
 }
 
-void FairMQExample6Sampler::CustomCleanup(void *data, void *object)
+void FairMQExample6Sampler::CustomCleanup(void* /*data*/, void *object)
 {
-    delete (string*)object;
+    delete static_cast<string*>(object);
 }
 
 void FairMQExample6Sampler::Run()