#101621: Request to port pythia 8.175 to the release branch. From rev…

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#101642: Porting request for AliZDCv4.cxx. From rev. 60176
Possibility to use Root from GIT repository. From rev. 62846
#101659 port to Release AliAODTZERO with T0 amplitude added. From rev. 62860 
#101664 Porting request: fix in AliMagF. From rev. 62778
#101678 EMCAL: Port fix to QA crashing amore. From rev. 62760 
#101679 Porting request: update in the description of ITS material. From rev. 61679
#101687 Please port TPC PID improvements to the Release. From rev. 60421,60700,60846,60847,61175,61807,61808,61825,61826, 61827,61881,61915,61996,62617,62812,62813
#101689 Recent changes in AliZDCDigitizer are needed in the release. From rev. 62636,62839
#101690: PORT AOD (HMPID related) files to trunk to release. From rev. 62214