#2146 Num Flooded PV: Add volume weighted mean for visible cells and current time step

ApplicationCode/ReservoirDataModel/RigEclipseNativeVisibleCellsStatCalc.h

@@ -45,6 +45,8 @@ public:
     virtual void    addDataToHistogramCalculator(size_t timeStepIndex, RigHistogramCalculator& histogramCalculator);
     virtual void    uniqueValues(size_t timeStepIndex, std::set<int>& values);
     virtual size_t  timeStepCount();
+    virtual void    mobileVolumeWeightedMean(size_t timeStepIndex, double &result);
+
 
 private:
     RigCaseCellResultsData*         m_caseData;