message: by default keep onthefly V0s (needed for conversion finding)
diff: @@ -484,15 +484,10 @@ void AliAnalysisTaskWeakDecayVertexer::UserExec(Option_t *)
  Info("UserExec","Number of pre-reco'ed V0 vertices: %i",nv0s);
  if( fkRunV0Vertexer ){
  - if ( !fkUseOptimalTrackParams ){
  - //reset all V0s, please
  - lESDevent->ResetV0s();
  - }else{
  //reset only offline V0s, please
  //important: reset cascades or RemoveV0s will NOT DO IT
  lESDevent->ResetCascades();
  SelectiveResetV0s(lESDevent, 0);
  - }
  if( !fkMonteCarlo ){
  Tracks2V0vertices(lESDevent);
  }else{
  