Included new package LArClusterCellDumper.
This MR is to include a new package (LArClusterCellDumper) that provides a ntuple.root with electrons, its clusters, cells and digits, linked to each other. This development is in the context of the QT of @mhufnage, related to cross-talk mitigation studies at LAr Calorimeter.
ping @gunal, @laforge, @pavol, @eegidiop,@monnier, @lucianom