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
a set?
do you relay need a set?
I understood that you have 10 bxs no more no less
I think that it will be way more efficient (and it may even vectorize) if you use fixed size array (size 10)