Add support for grid calculations as data source for statistics

- add data source selection, either Case Property or Grid Calculation
- add Time Step Selection, can be used for both dynamic case properties and Grid Calculations
- optionally release grid calculation data when statistics is computed
- recursive grid calculations is supported

ApplicationLibCode/ProjectDataModel/RimGridCalculationCollection.h

@@ -36,7 +36,11 @@ public:
 
     RimGridCalculation*              createCalculation() const override;
     std::vector<RimGridCalculation*> sortedGridCalculations() const;
+    std::vector<RimGridCalculation*> dependentCalculations( RimGridCalculation* sourceCalculation ) const;
 
 private:
+    RimGridCalculation* findCalculation( const QString& calculationName ) const;
+    bool dependentCalculationsRecursively( RimGridCalculation* sourceCalculation, std::vector<RimGridCalculation*>& calculations ) const;
+
     void initAfterRead() override;
 };