message: ATO-525 - use ExpandPath to get default AODB Path
diff: #include "AliESDtrack.h"
  #include "AliPIDtools.h"
  #include "TLeaf.h"
  +#include "TSystem.h"
  std::map<Int_t, AliTPCPIDResponse *> AliPIDtools::pidTPC; /// we should use better hash map
  std::map<Int_t, AliPIDResponse *> AliPIDtools::pidAll; /// we should use better hash map
  @@ -88,7 +89,9 @@ Int_t AliPIDtools::LoadPID(Int_t run, Int_t passNumber, TString recoPass, Bool_t
  pid->SetUseTPCMultiplicityCorrection(kTRUE);
  pid->SetUseTPCEtaCorrection(kTRUE);
  pid->SetUseTPCPileupCorrection(kTRUE);
  - pid->SetOADBPath("$ALICE_PHYSICS/OADB");
  + const char * aodbPath = gSystem->ExpandPathName("$ALICE_PHYSICS/OADB");
  + ::Info("AliPIDtools::LoadPID","form :%s",aodbPath);
  + pid->SetOADBPath(aodbPath);
  pid->InitialiseEvent(&ev,passNumber, recoPass, run);
  AliTPCPIDResponse &tpcpid=pid->GetTPCResponse();
  // pid.InitFromOADB(246751,1,"pass1");
  