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
@slava77 Since the ecalRechit collection is permanent in the AOD, we recycled the packed bits used for the OOT energy for the energy uncertainty. We will remove the method returning 0 so people won't be confused. On the usefulness of the kOutOfTime flag: if the algorithm is proven to work as expected, it will become obsolete and be dropped. It may be still needed for HLT if we don't manage to speedup the code enough. 

It makes sense to change the class version then. Note that the class version for DataFormats/EcalUncalibratedRecHit is changed because we added some extra data members.