More cppcheck warnings

Menu.hh

@@ -54,9 +54,9 @@ class Menu : public QMenu
 {
     bool pressed_;
   public:
-    Menu(QWidget* _parent = 0);
+    explicit Menu(QWidget* _parent = 0);
 
   protected:
     void mousePressEvent(QMouseEvent* _event);
     void mouseReleaseEvent(QMouseEvent* _event);
-};
\ No newline at end of file
+};

Toolbox.hh

@@ -64,7 +64,7 @@ class DatacontrolToolboxWidget : public QWidget, public Ui::dctoolbox
     void keyEvent( QKeyEvent* _event );
 
   public:
-    DatacontrolToolboxWidget(QWidget* _parent = 0);
+    explicit DatacontrolToolboxWidget(QWidget* _parent = 0);
 
   protected:
     

TreeModel.hh

@@ -69,7 +69,7 @@ signals:
 public:
 
     /// Constructor
-    TreeModel(QObject *_parent = 0);
+    explicit TreeModel(QObject *_parent = 0);
 
     /// Destructor
     ~TreeModel();

TreeView.hh

@@ -63,7 +63,7 @@ class DataControlTreeView : public QTreeView
     void keyEvent( QKeyEvent* _event );
 
   public:
-    DataControlTreeView(QWidget* _parent = 0);
+    explicit DataControlTreeView(QWidget* _parent = 0);
 
   protected:
     virtual void keyPressEvent ( QKeyEvent * event );