Implements a Python step_cleanup() method.

Continues the work in #2735 on implementing Python bindings for the flow
simulator.

opm/simulators/flow/FlowMainEbos.hpp

@@ -335,6 +335,15 @@ namespace Opm
             return simulator_->runStep(*simtimer_);
         }
 
+        // Called from Python to cleanup after having executed the last
+        // executeStep()
+        int executeStepsCleanup()
+        {
+            SimulatorReport report = simulator_->finalize();
+            runSimulatorAfterSim_(report);
+            return report.success.exit_status;
+        }
+
         // Print an ASCII-art header to the PRT and DEBUG files.
         // \return Whether unkown keywords were seen during parsing.
         static void printPRTHeader(bool output_cout)