boost W back to the level before Herwig adds FSR from the b (for MC@NLO), as suggested by Steve
add status=1 tops
add gen particle branches
minor
fill tau daughter leptons, and original status=3 W (after FSR in mc@nlo+herwig) in status=1 container
add more gen lepton info
add more gen lepton info
make compatible with ntuples with status=1,2 gen particles stored
move gen filling to a function
fix bug in filling  mctaud2_
store original status=3 particles (prior to MC@NLO+herwig pre-FSR corrections)
add identification of last stable b-hadron
fix variable name
add gen-level asymmetry variables
fix variable names
add gen-level ttbar branches to stop tree
add gen-level ttbar branches to stop tree
minor
fix crash
use negative weights, and fix to allow running on ttsl