New lines for hadronic R(Xc) measurements, LBHLT-395

New Hlt2 lines for the measurements of R(D0), R(D+), R(D*), R(Ds), R(Lc) and R(J/psi) using hadronic tau- -> pi-pi+pi-nu decays. The lines include the corresponding wrong-sign (i.e D+tau+) and NonPhys (tau->pi+pi+pi+) lines for background studies.

 'Hlt2Xc3PiXForTauD02Kpi'
 'Hlt2Xc3PiXForTauD02KpiWS'
 'Hlt2Xc3PiXForTauD02KpiNonPhys'
 'Hlt2Xc3PiXForTauD02K3pi'
 'Hlt2Xc3PiXForTauD02K3piWS'
 'Hlt2Xc3PiXForTauD02K3piNonPhys'
 'Hlt2Xc3PiXForTauDp2Kpipi'
 'Hlt2Xc3PiXForTauDp2KpipiWS'
 'Hlt2Xc3PiXForTauDp2KpipiNonPhys'
 'Hlt2Xc3PiXForTauDs2kkpi'
 'Hlt2Xc3PiXForTauDs2kkpiWS'
 'Hlt2Xc3PiXForTauDs2kkpiNonPhys'
 'Hlt2Xc3PiXForTauLc2pkpi'
 'Hlt2Xc3PiXForTauLc2pkpiWS'
 'Hlt2Xc3PiXForTauLc2pkpiNonPhys'
 'Hlt2Xc3PiXForTauJpsi2mumu'
 'Hlt2Xc3PiXForTauJpsi2mumuNonPhys'

The committed new files are:

Hlt/Hlt2Lines/python/Hlt2Lines/Xc3PiXForTau/Stages.py
Hlt/Hlt2Lines/python/Hlt2Lines/Xc3PiXForTau/Lines.py
Hlt/Hlt2Lines/python/Hlt2Lines/Xc3PiXForTau/Inputs.py
Hlt/Hlt2Lines/python/Hlt2Lines/Xc3PiXForTau/__init__.py
Hlt/HltSettings/python/HltSettings/Xc3PiXForTau/__init__.py
Hlt/HltSettings/python/HltSettings/Xc3PiXForTau/Xc3PiXForTau_pp_2018.py