Obtaining the value of --nskip put in on the command line (or if it is specified in the input fcl document), from within a module.
From Robert Sulej.

#include "fhiclcpp/ParameterSet.h" 
#include "fhiclcpp/ParameterSetRegistry.h" 

 // Or maybe there was --nskip specified in the command line or skipEvents in FHiCL?
  auto const & p0 = fhicl::ParameterSetRegistry::get().begin()->second;
  if (p0.has_key("source.skipEvents"))
    fStartEvent += p0.get<int>("source.skipEvents");

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