doc/TODO.md: Some more immediate ideas
doc/TODO.md: Some more immediate ideas

We have two branches f/quantitylat and q/cluefeatures which we can't
merge as they cause overfitting. These TODO items are aimed at fixing
that to get them in mergeable shape.

Martinfx/yodaqa,Martinfx/yodaqa,Martinfx/yodaqa,vineetk1/yodaqa,vineetk1/yodaqa,vineetk1/yodaqa,vineetk1/yodaqa,Martinfx/yodaqa,Martinfx/yodaqa,vineetk1/yodaqa,Martinfx/yodaqa,vineetk1/yodaqa