Creating a new Rel21 derivation DAOD_BPHY27

A new derivation is created for the Bell's inequality analysis using the flavor-entangled B0 meson pairs (ANA-BPHY-2021-01).

This is majorly based on BPHY22 with a minor modifications that:

• The K/pi track pT threshold in the Kpi finder lowered from 900MeV to 450MeV. 
  • Accordingly, a property (maxNTracksInEvent) is added to the JpsiFinder package to skip events with too many tracks. This is to avoid too long process time per event. A maximum 500 tracks per event is set for BPHY27.
• Removed the pT cut for the reconstructed B meson candidate (>9.5GeV -> >0GeV).
  • The 9.5GeV cut has been hardcoded in DerivationFramework/src/MuPlusDpstCascade.cxx, which is now changed to be configurable through a property (PtLowerCut). By default, the 9.5GeV cut still exists. The behavior is confirmed to be unchanged for BPHY22.
• Event skim 
  • Before: >=1 reconstructed B-vertex
  • After: >=2 muon (pT>3GeV, |eta|<2.7)
• MET collection added
• A few truth collections are added