Feature Request: fully automatic two step training with data augmentation

[chreul]

our experiments have shown that, when using data augmentation, a two step training approach is sensible:

1. train on all available lines (real + augmented).
2. refine the models resulting from 1 by training on real lines only and use the outcome of 1 as a starting point.

it would be nice if these training steps could be automatically performed by calamari without requiring any futher input by the user. the auto config proposed in #33 might be helpful :-).

[ChWick]

closed by 39ab967