Dumped dataset should contain predictions

[billy-mosse]

Hi! Great tool.

When I run the code with an initial dataset, the synthetic datarows get added to the dumped dataset, but I think it would be great to also see the synthetic predictions (to make sure they are correct, for example). What do you think? I wouldn't mind adding this feature myself.

[Eladlev]

Sounds like a great feature doing this separation