Merge branch '406-rmv-overlap-line-for-dg2' into 'feature'

Resolve "rmv Overlap line for dg2"

Closes #406

See merge request mpp/mpp!395

src/lib2_mesh/distribution/Overlap.cpp

@@ -707,7 +707,7 @@ void Overlap::CellsOverlap_dG2(Mesh &mesh) const {
         }
       }
 
-      mesh.InsertOverlapCell(c->second);
+      //mesh.InsertOverlapCell(c->second);
       mesh.procSets.Add(c(), PPM->proc());
 
       if (!send_list.empty()) {
@@ -752,4 +752,5 @@ void Overlap::CellsOverlap_dG2(Mesh &mesh) const {
       delete C;
     }
   }
+  mesh.procSets.RemoveSingle();
 }