New Ecal Local Reconstruction with Multifit

Adds additional EcalUncalibRecHitWorker for MultiFit (using Fast NNLS algorithm) and modifies appropriate sequences to activate it by default.

@argiro @emanueledimarco
"4095" appears 4 times in RecoLocalCalo/EcalRecAlgos and 6 times in (related to the PR packages of) RecoLocalCalo. The formula itself  A = (4095. - ped) * gainR appears several times. Code repetitions are not nice.