[PWGDQ] Many optimizations and warning fixes (#8637)

Co-authored-by: Ionut Cristian Arsene <iarsene@cern.ch>

Author: iarsene

PWGDQ/Core/HistogramManager.cxx

@@ -14,6 +14,8 @@
 #include <iostream>
 #include <memory>
 #include <fstream>
+#include <list>
+#include <vector>
 #include "Framework/Logger.h"
 using namespace std;
 
@@ -137,7 +139,7 @@ void HistogramManager::AddHistogram(const char* histClass, const char* hname, co
   }
   // check whether this histogram name was used before
   if (hList->FindObject(hname)) {
-    LOG(warn) << "HistogramManager::AddHistogram(): Histogram " << hname << " already exists";
+    LOG(warn) << "HistogramManager::AddHistogram(): Histogram " << hname << " already exists in class " << histClass;
     return;
   }