Add CaloDigits v2 and CaloClusters v2
- add a 'v2' CaloDigit which is not a KeyedObject.
- add unit test
- adapt Calo decoding accordingly
- add a 'v2' CaloCluster which is (also) not a KeyedObject.
- add unit test
Note: must be applied in conjunction with Rec!1740 (merged), which updates the cellular automaton clustering to consume v2 digits, and produce v2 clusters, and updates the consumers of Digits
Edited by Rosen Matev