Use alternate MC association for v2 calo digits/clusters
changes required for LHCb!2166 (merged) , Lbcom!438 (merged), Rec!1740 (merged)
temporarily undoes !971 (merged)
Edited by Rosen Matev
changes required for LHCb!2166 (merged) , Lbcom!438 (merged), Rec!1740 (merged)
temporarily undoes !971 (merged)