minor refactoring

mlmc/src/estimators/datastructure/LevelMaps.cpp

-#include "LevelMaps.hpp"
 #include "MultilevelEstimator.hpp"
+#include "LevelMaps.hpp"
+#include "MonteCarlo.hpp" // todo remove as soon as new MonteCarlo disappears
 
 
 template<>

mlmc/src/estimators/datastructure/LevelMaps.hpp

@@ -2,26 +2,16 @@
 #define LEVELMAPS_HPP
 
 #include "WelfordAggregate.hpp"
-#include "MonteCarlo.hpp"
-
-#include <math.h>
-
-
-#include "Logging.hpp"
 
 #include <vector>
+#include <math.h>
 #include <map>
 
 
-/*
- * Todo: make second key template for degree
- *   to realize MultidegreeMonteCarlo
- */
-
 template<typename T>
 struct LevelMap {
 protected:
-  std::map<int, T> _levelMap;
+  std::map<int, T> _levelMap{};
 
 public:
   LevelMap() {};