Branch from feat/add_ePixCorrection to add Correction_ePix_NBC.ipynb

Fix spelling of comments

Improve formatting

Fix veriable definition

Move functions to separate file

Move PlotFromCalDB to dedicated folder

Store in notebook example plots

Add more comments to input parameters

PEP formatting. Remove unused functions.

Clean-up function to save dict to h5

Further clean-up function to save dict to h5

Folmatting

Add plots for medium gain stage

Make reading more general

Add plot for standard deviation. Simplify plotting.

Add actual plots

Rename variables

Add example to description