Integrate a new, optimized EcalUncalibRecHitRatioMethodAlgo.

from: https://github.com/VinInn/cmssw/blob/optimizeEcal/RecoLocalCalo/EcalRecAlgos/interface/EcalUncalibRecHitRatioMethodAlgo.h
Merge pull request #2582 from dmitrijus/optimizeEcal

RecoLocalCalo/EcalRecAlgos -- Integrate a new, optimized EcalUncalibRecHitRatioMethodAlgo.