message: Make sure the helix phase is in -pi:pi range
diff: @@ -330,8 +330,8 @@ Double_t AliHelix::GetPhase(Double_t x, Double_t y ) const
  //
  Float_t delta = TMath::Nint((phase2-fHelix[2])/(2.*TMath::Pi()));
  phase2-= 2*TMath::Pi()*delta;
  - if ( (phase2-fHelix[2])>TMath::Pi()) phase2 -=2.*TMath::Pi();
  - if ( (phase2-fHelix[2])<-TMath::Pi()) phase2+=2.*TMath::Pi();
  + while ( (phase2-fHelix[2])>TMath::Pi() ) phase2 -=2.*TMath::Pi();
  + while ( (phase2-fHelix[2])<-TMath::Pi() ) phase2+=2.*TMath::Pi();
  Double_t t = (phase2-fHelix[2]);
  t/=fHelix[4];
  