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
I added a static const int in the DataFormats/EcalDigi/interface/ and used it in the RecoLocalCalo (similarly to what has been done for MAXSAMPLES)