Heppy: 'from ROOT.heppy import TriggerBitChecker' doesn't seem to work, but ROOT.heppy.TriggerBitChecker works
Heppy: GeneratorAnalyzer was moved to gen so it should not be in objects.all
HeppyCore: local multithread fixes:
- get exception stack traces when running multithread,
- support non-pickleable configuration with multithread
  (needed for the AutoFillTreeProducer in Heppy)
HeppyCore: provide also information on the component in which the exception was thrown
Merge pull request #8 from gpetruc/heppy_7_2_2_patch2

Further Heppy bugfixes