Fix assignment of necessary information for pfmva
get rid of dead code
do not allow ROs that both have GSF tracks and clusters to merge.
fix the assignment of early/late brem.
fix local locking of ECAL clusters.
Add protection against sqrt(negative value) due to numerical rounding effects
Merge pull request #1752 from Martin-Grunewald/FixJetAreaCalculation

Reco fixes -- Add protection against sqrt(negative value) due to numerical rounding effects.
Merge pull request #1644 from lgray/fixes_for_pre10

Reco fixes -- Cleanup of Old MVA assignment / kill dead code / bugfixes