- When no data trains to correct skip plots gracefully before checking corrected data.
- When no lit frames available to correct, make this very clear by replacing empty list with a message of no frames to correct
- Show shutter configuration for SPB and MID.
- check shutter function to check shutter configuration.

decide on splitting the change in two and have the current branch only for introducing rel_gain_mode and next branch for replacing rel_gain with rel_gain_mode to have one parameter only

final changes related by differentiating between module index and module numbers. This should all be replaced with CALCAT metadata

1.Plot agipd single module geometry for correct and darks
2.Fix sorting dark runs
3.Fix reading a single module which doesnt start at 0

- replace np.percentile(, [0,100]) with min(), max()
- put back histogram plots with get_range for no need of change.
- improve gain plot and add clamp function