1) Added protection in correlation analysis classes, input AOD must be of the type...

1) Added protection in correlation analysis classes, input AOD must be of the type AliAODPWG4ParticleCorrelation
2)AliAnaParticleHadronCorrelation: In case with correlation with pi0, pi0 found and stored in AOD. Configuration and Train macros updated accordingly.
3)AliAnaParticleJetLeadingConeCorrelation: Many bugs related to phi definition in TLorentzVectors corrected, added histograms with xi calculation for leading particles.