message: fix naming in omega AddTask
diff: -AliAnalysisTask* AddMyTask_mwaelde_AcceptanceEfficiency(TString name = "name")
  +AliAnalysisTask* AddTask_mwaelde_AcceptanceEfficiency(TString name = "name")
  {
  // get the manager via the static access member. since it's static, you don't need
  // to create an instance of the class here to call the function
  