IHisto start duplication of content in m_vec

Device/Histo/IHistogram.h

@@ -16,6 +16,7 @@
 #define BORNAGAIN_DEVICE_HISTO_IHISTOGRAM_H
 
 #include "Base/Py/PyObject.h"
+#include "Base/Types/OwningVector.h"
 #include "Device/Data/CumulativeValue.h"
 #include <memory>
 #include <string>
@@ -176,6 +177,7 @@ protected:
     void copyContentFrom(const IHistogram& other);
 
     const std::unique_ptr<const Frame> m_frame;
+    OwningVector<CumulativeValue> m_vec;
     std::unique_ptr<Powerfield<CumulativeValue>> m_data;
 };