Use set of names of defunct wells from load balancer for parallel WellManager.

Instead of the WellsManager guessing which wells are handled by other
processes we now use tha ouput of the load balancer to compute wells
that are handled by other processes.

With the previous approach it was not possible to calculate this information
correctly. Wells with only one completion next to the border of the
processes' partition were represented on multiple processes. In additition
wells that the eclipse schedule section defined with completions on non-active
cells in sequential runs were not at all calculated in parallel runs.

With the new approach the CpGrid::loaBalance routine returns the set names of
wells that are not handled by this process when setting up the simulation. This
information is then used throughout the simulation.

opm/autodiff/SimulatorFullyImplicitBlackoil.hpp

@@ -61,9 +61,10 @@ public:
                                    const bool vapoil,
                                    std::shared_ptr<EclipseState> eclipse_state,
                                    BlackoilOutputWriter& output_writer,
-                                   const std::vector<double>& threshold_pressures_by_face)
+                                   const std::vector<double>& threshold_pressures_by_face,
+                                   const std::unordered_set<std::string>& defunct_well_names)
     : Base(param, grid, geo, props, rock_comp_props, linsolver, gravity, disgas, vapoil,
-           eclipse_state, output_writer, threshold_pressures_by_face)
+           eclipse_state, output_writer, threshold_pressures_by_face, defunct_well_names)
     {}
 };