Add new 2018-pbpb calibration, and define constants to make uncalibrated periods more obvious (!35) · Merge requests · LHCb CondDB / LHCBCOND · GitLab

inclusion of new constants for PbPb 2018 (hengne.li@cern.ch, bursche@cern.ch)
inclusion of constants to indicate periods for which no calibration is available (daniel.johnson@cern.ch)