Herwig : MB tune, UE handling
. change in aligenMC to be compatible with MCgen LEGO train (needed for PWG-JE especially)
See under this repo aligenmc last commit : "Fix MB tune and UE handling for Herwig 7.2" (#6)
. Changes in line with ongoing updates of HEPmc headers on the AliRoot side (alisw/AliRoot#1241)