CaloCluster_OnTrackBuilder add Cfg and further cleanup comments
CaloCluster_OnTrackBuilder
- add Cfg
- further cleanup
- some comments
For now this is not used somewhere. Note that :
- We have a proper parametrization for the energy resolution.
- We prb need to derive one for the cluster phi resolution. Assuming ~ uniform distribution with (a-b) the Lar cell size is the guess we use elsewhere.
- Probably we do not want really need/want to use the eta