migrate from minuit to inline TMatrix/TVector-based NNLS algorithm
restore deprecated accessors to avoid interface incompatibility
fix indices for out of time energy in case not all bxs are active (might happen in the future)
further performance optimizations
make minimizer a data member of the algo so that memory is only allocated once
Merge branch 'ecalMultifit_minimal720p4' of github.com:bendavid/cmssw into ecalMultifit_minimal720p4
Merge the NNLS implementation with the DataFormats changes and the python configuration