Changes since CMSSW_5_3_16:
- #2721 from @wmtan: Avoid playback segfault on empty file list53x
- #2450 from @hroskes: Update to cosmic track splitting validation
- #2342 from @frmeier: Patch hierarchyconstraints to CMSSW_5_3_X
- #2386 from @hroskes: Update to tracker alignment systematic misalignment tools
- #2546 from @RylanC24: fixed MixBoostEvtVtxGenerator.cc
- #2593 from @fatala22: Modified PhysicsTools/Utilities/scripts/edmPickEvents.py
- #2606 from @inugent: Update TTbar_GenLepAnalyzer.cc