WIP Clean up CaloMoniAlg and CaloPIDsChecker and protect against uninitialised momentum

Marco Cattaneorequested to merge
protectUninitMomentumInCaloPIDsChecker into master
  • Temporary protection on line 244 of CaloPIDsChecker.cpp prevents histograms being polluted by uninitialised momentum for tracks that do not have a DLL
  • Code modernisations and cleanups

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