Qvs gandtk met

General interest
1) add Q vs G likelihood
2) fix multilepton config as introduced in 124
3) created metAnalyzer and added tkmet
4) added some official T2tt sample

MT2 specific
A) fix initial parameter  in KT
I'd say instead *if ipart.status() not in [3,23]:* so that it works also for pythia 6 (some MC samples are hadronized with that and not pythia 8)