Improve outputs of DecayTreeFitter
This MR is split from DaVinci!1347
The aim is to improve the DTF output.
It includes:
- Additional DTF outputs:
FitStatus,FitChi2,ErrorCode,FitNDoF - A consolidated C++ struct to hold these outputs:
FitResultSummary - New functors to access the contents of
FitResultSummary - FunTuple support for
FitResultSummary, so users can tuple all information at once
This MR has to be tested with: DaVinci!1378
Edited by Jiahui Zhuo