add top pt reweighting vars
The GenTops
branch stores at most 2 particles, the top and antitop (in that order) selected by TtGenEvent
.
NB, to use GenTopWeight
properly for each event, you must divide it by the average of GenTopWeight
for the whole sample in order to preserve the overall cross section.
This PR also adds an option to dump a command-line-customized runMakeTree config.