reading.py changes to allow MC object reading for sprucing

Nicole Skidmorerequested to merge
MC_Sprucing into master
  • Trivial configuration of OutputLevel in helpers
  • Adding annsvc_name parameter to decoder - needed for simplification of Hlt/RecoConf/python/RecoConf/reco_objects_for_spruce.py in Moore!1299 (merged)

To go with Moore!1299 (merged).

Edited by Nicole Skidmore

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