Make the rules_per_phase work, in combination with stopping on failure

model/model.py

@@ -246,7 +246,11 @@ class ModelverseKernel(AtomicDEVS):
                 elif self.state.phase == "input":
                     self.state.phase = "computation"
                 elif self.state.phase == "computation":
-                    self.state.phase = "output"
+                    if not self.state.mvk.success or (self.state.execution_counter > self.rules_per_phase):
+                        self.state.phase = "output"
+                        self.state.execution_counter = 0
+                    else:
+                        self.state.execution_counter += 1
                 elif self.state.phase == "output":
                     self.state.users.pop(0)
                     self.state.phase = "init_user"