E/gamma particle based isolation.
Additionally, implement some comments from previous code review.
Update particle based isolation: remove the pair from the map.
Stick in just a vector of PFCandidates- only the candidates which needs to be excluded from the isolation sums, make the cone size configurable and fix the value to infinite cone
ged electron regression implementation
working on regression common regression calculation framework
add DB source and ES prefer for gedelectron ECAL regressions, fix a crash