message: Save hhistos in root file
diff: @@ -93,6 +93,7 @@ Bool_t DrawTrendingAODTrackQA(TString mergedTrendFile = "trending.root",
  }
  legfb->Draw();
  cFBfrac->SaveAs("TrendFracTrackPerFiltBit.png");
  + cFBfrac->SaveAs("TrendFracTrackPerFiltBit.root");
  TCanvas* cFBpt=new TCanvas("cFBpt","Filt bit <pt>",1200,900);
  first=kTRUE;
  @@ -121,6 +122,7 @@ Bool_t DrawTrendingAODTrackQA(TString mergedTrendFile = "trending.root",
  }
  legfb->Draw();
  cFBpt->SaveAs("TrendAverPtPerFiltBit.png");
  + cFBpt->SaveAs("TrendAverPtPerFiltBit.root");
  TCanvas* cME=new TCanvas("cME","MatchEff",1200,900);
  cME->Divide(1,3);
  @@ -177,6 +179,7 @@ Bool_t DrawTrendingAODTrackQA(TString mergedTrendFile = "trending.root",
  cME->cd(1);
  legME->Draw();
  cME->SaveAs("TrendMatchingEff.png");
  + cME->SaveAs("TrendMatchingEff.root");
  return kTRUE;
  