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
Yes, xplus100-x0 is just _errvec[ipulseintime], and no, _errvec[ipulseintime] cannot be zero.  (It's the inverse second derivative of the chisq with respect to the in-time amplitude)