Default monitoring of filtered combiners

Marian Stahlrequested to merge
mstahl_monitor_filter_on_combiner into master

Issue: if no ParticleCombiner is passed to the control flow, but only a ParticleFilter acting on top of a ParticleCombiner, no (default) histograms are produced.

Proposed Solution: Allow default monitoring of ParticleFilter if they act on the output of a ParticleCombiner. Concatenate their cuts to parse ranges for histograms.

Thanks to @cmarinbe for reporting this!

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