added par vs ch plots

[sofia-calgaro]

Two main new features:

1. when out of thresholds, corresponding timestamps are printed out in the terminal. However, since we inspect resampled values while building the status map, we don't get the actual keys to remove. Typically, for the analysis, we want to remove exactly the timestamp where something bad happened (eg spike), but this is not always the case when using the resampled values. Moreover, it would be nice to save the out-of-threshold timestamps somewhere, in order to remove those events further on during the analysis.
2. there is the possibility to plot one parameter value vs the channel ID of geds. At the moment, this works for inspecting the FWHM, grouping channels by string. In this case, the config-subsystem part looks like:

"subsystems": {       
      "geds": {
          "FWHM in pulser events":{
              "parameters": "FWHM",
              "event_type": "pulser",
              "plot_structure": "array",
              "plot_style" : "vs ch"
          }
      }
  }

The output would look like this (might change a bit in the future):

For each string, the mean of FWHM values is evaluated (see horizontal black line) and printed out in the legend.