Merge branch 'Refactor-VtuPlot' into 'feature'

[Refactor-VtuPlot] flush after plot file

See merge request mpp/mpp!393

src/lib4_fem/plot/VtuPlot.cpp

@@ -582,6 +582,8 @@ void VtuPlot::PlotFile(const string &filename) {
   if (PPM->Master(CommSplit())) {
     createVtu(filename);
   }
+
+  Flush(PlotStatus::FLUSH);
 }
 
 void VtuPlot::ClearMesh() {