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
The code is in the header file because it is a template class that works on the EBDataFrame and EEDataFrame (analogously to the other algorithms in the same package).
Yes, there are of course many repetitions of the loop over the 10 samples of the ECAL digis.