adding updateGroupControls() to StandardWellsDense

which separates the group control related operations. The group control
has to be handled in the level of all wells, which makes more functions
of the well class to be visible outside.

opm/autodiff/StandardWellsDense.hpp

@@ -294,6 +294,8 @@ enum WellVariablePositions {
 
             void applyVREPGroupControl(WellState& well_state) const;
 
+            void updateGroupControls(WellState& well_state) const;
+
         protected:
             bool wells_active_;
             const Wells*   wells_;