Allow clusters and digits to *always* be cloned.

In the Stripping, most objects are cloned via their association to Particle objects, so it can make sense to conditionally clone objects in the Particle dependency tree based on properties of that Particle (e.g. its charge).

The CaloHypoCloner and CaloClusterCloner tools were updated in !142 (merged) such that the cloning of objects in the CaloHypo and CaloCluster dependency trees is dependent upon the parent cloner tool passing a pointer to a Particle, whose charge is used to determine whether descendent CaloDigit objects are cloned.

In Moore, we clone whole containers of objects, and so need to configure algorithms in a way that is unconditional on what parent cloner might be (indeed, there may not be a parent cloner).

This MR adds flags to the CaloHypoCloner and CaloClusterCloner tools that, when true, ignore the Particle pointer and always clone the descendent CaloDigit objects.

/cc @jonrob (as author of !142 (merged)) @rmatev