- not using activities to plan cloned orders
- not setting dates on sale order line anymore, they are acquired from the sale order
- DateTime arithmetics explained
- adding some filtering to the getInventoryList call
- explained a bit more about the fictional story behind the data
- instructing users to search for the exact state of the sale order instead of using a filter with very poor performance

- explanation about the preparation of data for scikit-learn fit methods
- removed SGD regression because its prediction is very bad and makes the plot really ugly