removing well_soltutions_ from WellStateFullyImplicitBlackoilDense

adding function setWellSolutions() to StandardWell.

The class WellStateFullyImplicitBlackoilDense is ready to be removed
now, while the only thing can go wrong compred with the original version
is the group control, which is not tested yet.

opm/autodiff/WellInterface.hpp

@@ -104,7 +104,7 @@ namespace Opm
                           const double gravity_arg,
                           const int num_cells);
 
-        virtual void setWellVariables(const WellState& well_state) = 0;
+        virtual void setWellVariables() = 0;
 
         virtual bool getWellConvergence(Simulator& ebosSimulator,
                                         const std::vector<double>& B_avg,
@@ -153,6 +153,8 @@ namespace Opm
 
         virtual void updateWellControl(WellState& xw) const = 0;
 
+        virtual void setWellSolutions(const WellState& well_state) const = 0;
+
     protected:
         const std::vector<bool>& active() const;