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Add type annotations to BeamSpotTool code
Add track-based method
Update BeamSpotTool for release 22
Multi-file support
Add protection for missing fill number
Fix nullptr test in PyROOT
Add unit test for database access; improve exception handling
Replace logging warn() with warning()
Fix bug in db_trans and unit tests, Py3 fixes
Replace cPickle with pickle for Py3
Replace ERS_INFO with ERS_LOG
Add ROOT libraries for CentOS 7 linker