Allow to take S-curves in ZCC mode
Description
While performing R&D on the GEM timing, it became clear that a better understanding of the ZCC mode and ZCC threshold was required. Amongst others, the S-curves are always a precious tool. If one can always prepare configuration files to enable select mode or another, allowing the user to configure the comparator mode (and its threshold) via the calibration suite Web UI is a pleasant feature for the operator.
In general, we should probably revise how the detector can be configured via the calibration suite in order to reduce duplication. We would want "sections" to be available in all or some of the scans: common (e.g. thresholds, masking); timing (S-curves, calibration pulse scan); or scan-specific (e.g. the number of triggers of the GBT RX phase scan).