message: Updated RemoveGraphDuplicates so that always first and last points are kept
  (previously only first)
diff: @@ -477,8 +477,11 @@ void AliDCSSensorArray::RemoveGraphDuplicates(Double_t tolerance){
  Double_t x=-999.,y=-999., x0=-999.,y0=-999.;
  if (graph) {
  Int_t npoints=graph->GetN();
  - if (npoints>1) {
  - for (Int_t i=npoints-1;i>0;i--) {
  +
  +// Keep first and last point anyway ( i.e. npoints-2 ...)
  +
  + if (npoints>2) {
  + for (Int_t i=npoints-2;i>0;i--) {
  graph->GetPoint(i,x,y);
  graph->GetPoint(i-1,x0,y0);
  if ( TMath::Abs(y-y0) < TMath::Abs(tolerance*y0) ) graph->RemovePoint(i);
  