- With this commit dark processing should work with no summary chapters
- Remove RedBu cmap as a bonus change

- 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

1- Introduce AgipdCtrlDark dataclass
2- Convert AgipdCtrl class to dataclass
3- Replace cells for reading/validating AGIPD Conditions with AgipdCtrlDark