Propagate changes from CaloFutureShowerOverlapTool

Carla Marin Benitorequested to merge
calofuture_showeroverlap into master

Adapt interface to changes in CaloFutureShowerOverlapTool, see Rec!1273 (merged)

I've just moved the changes in !1420 (closed) to CaloFuture

Edited by Marco Cattaneo

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