AliAODPid.cxx.diff make getter const

AliAODPid.cxx.diff           make getter const
AliAODPid.h.diff             make getter const
AliAODpidUtil.cxx.diff       clean up TRD pid calculation
AliAODpidUtil.h.diff         clean up TRD pid calculation
AliAODTrack.h.diff           Add interface for HMPIDpid
AliESDpid.cxx.diff           clean up TRD pid calculation
AliPIDResponse.cxx.diff      add TRD pid calculation, add HMPID probs
AliPIDResponse.h.diff        add TRD pid calculation, add HMPID probs
AliTRDPIDResponse.cxx.diff   updates from Markus Fasel
AliTRDPIDResponse.h.diff     updates from Markus Fasel
AliVTrack.h.diff             Add interface for HMPIDpid
J. Wiechula