CPAlgorithms: more user-side improvements

This MR implements the following changes for smoother user experience:

• allow to read data23 in the Campaigns enum
• autoconfigure the runNumber used in the PMG CutBookkeepers
• remove the "expert-level" EventSelectionConfig blocks from the YAML setup, and instead expose the much nicer make-method (which takes care of filtering behind the scenes and avoids having to repeat generic settings e.g. like object collections)

On that last point, the current way to set up two simple selections and filter on them is written as:

EventSelection:
  - name: 'SUBcommon'
    electrons: 'AnaElectrons.loose'
    muons: 'AnaMuons.tight'
    jets: 'AnaJets.baselineSel&&jvt_selection'
    met: 'AnaMET'
    btagDecoration: 'ftag_select_DL1dv01_FixedCutBEff_85'
    noFilter: True
    selectionCuts: |
      JET_N_BTAG >= 2
      JET_N_BTAG DL1dv01:FixedCutBEff_70 >= 1
      JET_N 25000 >= 4
      MET >= 20000
      SAVE
  - name: 'ejets'
    electrons: 'AnaElectrons.loose'
    muons: 'AnaMuons.tight'
    jets: 'AnaJets.baselineSel&&jvt_selection'
    met: 'AnaMET'
    btagDecoration: 'ftag_select_DL1dv01_FixedCutBEff_85'
    noFilter: True
    selectionCuts: |
      IMPORT SUBcommon
      EL_N 25000 >= 1
      EL_N tight 25000 == 1
      MU_N 25000 == 0
      MWT < 170000
      MET+MWT > 40000
      SAVE
  - name: 'mujets'
    electrons: 'AnaElectrons.loose'
    muons: 'AnaMuons.tight'
    jets: 'AnaJets.baselineSel&&jvt_selection'
    met: 'AnaMET'
    btagDecoration: 'ftag_select_DL1dv01_FixedCutBEff_85'
    noFilter: True
    selectionCuts: |
      EL_N 25000 == 0
      MU_N 25000 > 0
      MU_N 25000 == 1
      IMPORT SUBcommon
      SAVE

EventSelectionMerger:
  selections:
    - 'pass_ejets_%SYS%'
    - 'pass_mujets_%SYS%'
  noFilter: False

EventCutFlow:
  - postfix: 'ejets'
    customSelections: 'ejets'
  - postfix: 'mujets'
    customSelections: 'mujets'

while with the proposed changes it becomes:

EventSelection:
  - electrons: 'AnaElectrons.loose'
    muons: 'AnaMuons.tight'
    jets: 'AnaJets.baselineSel&&jvt_selection'
    met: 'AnaMET'
    btagDecoration: 'ftag_select_DL1dv01_FixedCutBEff_85'
    noFilter: False
    cutFlowHistograms: True
    selectionCutsDict:
      'SUBcommon': |
        JET_N_BTAG >= 2
        JET_N_BTAG DL1dv01:FixedCutBEff_70 >= 1
        JET_N 25000 >= 4
        MET >= 20000
        SAVE
      'ejets': |
        IMPORT SUBcommon
        EL_N 25000 >= 1
        EL_N tight 25000 == 1
        MU_N 25000 == 0
        MWT < 170000
        MET+MWT > 40000
        SAVE
      'mujets': |
        EL_N 25000 == 0
        MU_N 25000 > 0
        MU_N 25000 == 1
        IMPORT SUBcommon
        SAVE