[PWGCF] radialFlowDecorr: fixed pT ranges, common weight-map binning, eta axes, memory

- Observables in three fixed pT ranges, filled in the same mean and fluctuation passes with every
  variation: 0.2-3 (nominal), 0.5-3 (_pt1) and 0.2-5 GeV/c (_pt2). Profiles with an eta-bin index
  axis carry the range as blocks of that axis; the (eta, eta) maps of ranges 1-2 are separate
  profiles with suffix _pt1/_pt2; the (gap, sum) maps are booked for the nominal range only.
  Bootstrap replicas of ranges 1-2 in a second registry.
- cfgPtMin, cfgPtMax, cfgCutPtLower and cfgCutPtUpper removed: tracks and MC particles are selected
  in 0.15-10 GeV/c in every pass, and the efficiency and flattening passes fill the maps over 0.15-10.
  EffpTDep keeps its anchor at 0.2 GeV/c.
- One pT axis for the efficiency, fake, secondary and other-collision maps and the weight QA:
  0, 0.15, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 1, 1.2, 1.4, 1.6, 1.8, 2, 2.5, 3, 3.5, 4, 5, 7, 10 GeV/c.
  Flattening maps: pT {0, 0.15, 0.2, 0.4, 0.6, 0.8, 1, 3, 5, 7, 10}, 1 cm vertex bins (-12, 12),
  2 charge bins, 20 eta bins (-1, 1), 32 phi bins.
- Eta: reco tracks unchanged (global tracks, |eta| < cfgCutEta = 0.8); MC truth particles kept to
  |eta| < 1 for the truth/reco migration. Map eta axes span -1 to 1; observable eta bins span
  |eta| < 1 in MC and |eta| < cfgCutEta in data; the reference bin stays |eta| < cfgCutEta.
- MC follows cfgEtaBinWidth (no longer fixed to 0.2).
- Memory: flattening weights held as dense THnF in the mean and fluctuation passes; profiles filled
  with unit weights carry no per-bin sum of squared weights (the bootstrap keeps it); mean and
  fluctuation split groups may leave Base out of cfgSystMask (the efficiency and flattening passes
  keep it; the bootstrap runs only with Base).
- The fluctuation pass stops with a clear error if the mean-pass binning does not match.

Author: somabhatta