bbtt leading/sub-leading Tau flags for systematics checking

• Added leading/sub-leading tau flags following the similar MR !771 (merged)
• Testing output with the config file RunConfig-bbtt-bypass-syst.yaml and the same data file as in !771 (merged) (mc20_13TeV.600459.PhPy8EG_PDF4LHC15_HHbbttHadHad_cHHH01d0.deriv.DAOD_PHYS.e8273_s3681_r13144_p6026)
• There's only one tau-related systematics: TAUS_TRUEHADTAU_SME_TES_INSITUFIT
• Examples (table below) of scanning the tree using command: AnalysisMiniTree->Scan("tau_isTau1___NOSYS:tau_isTau2___NOSYS:tau_pt___NOSYS:tau_isTau1___TAUS_TRUEHADTAU_SME_TES_INSITUFIT__1down:tau_isTau2___TAUS_TRUEHADTAU_SME_TES_INSITUFIT__1down:tau_pt___TAUS_TRUEHADTAU_SME_TES_INSITUFIT__1down:tau_isAnalysisTau___NOSYS:tau_isAnalysisTau___TAUS_TRUEHADTAU_SME_TES_INSITUFIT__1down", "tau_isAnalysisTau___NOSYS == 1")
  • isAnalysisTau_SYS is all 0 for all events.
  • pT changes a little with applying systematics variation.

Row	Instance	isTau1_NOSYS	isTau2_NOSYS	tau_pt_NOSYS	isTau1_SYS	isTau2_SYS	tau_pt_SYS	tau_isAna_NOSYS	tau_isAna_SYS
0	0	0	0	98419.476	0	0	98419.476	0	0
0	1	0	0	87839.171	0	0	87839.171	0	0
0	2	0	0	80007.210	0	0	80007.210	0	0
0	3	0	0	45642.085	0	0	45642.085	0	0
0	4	1	0	42515.324	0	0	42345.261	1	0
1	0	0	0	68752.656	0	0	68752.656	0	0
1	1	0	0	63697.253	0	0	63631.035	0	0
1	2	0	0	56418.125	0	0	56418.125	0	0
1	3	0	0	20436.240	0	0	20436.240	0	0
2	0	1	0	89728.765	0	0	89728.765	1	0
2	1	0	0	82334.390	0	0	82334.390	0	0
2	2	0	0	63427.421	0	0	63427.421	0	0
3	0	1	0	170738.42	0	0	170738.42	1	0
3	1	0	0	167602	0	0	167602	0	0
4	0	0	0	74997.382	0	0	74997.382	0	0
4	1	1	0	33589.195	0	0	33454.835	1	0
4	2	0	0	24821.982	0	0	24821.982	0	0
4	3	0	1	24809.666	0	0	24710.427	1	0
4	4	0	0	21034.720	0	0	21034.720	0	0

tagging @mfujimot , @bmoser , @pbokan , @jdegens , @shahzad , @tstreble

_will clean code after approved _