[scikit-learn] make all new parameters keyword-only?

[Joel Nothman]

We could just announce that we will be making this a syntactic constraint
from version X and make the change wholesale then. It would be less formal
backwards compatibility than we usually hold by, but we already are loose
with parameter ordering when adding new ones.

It would be great if after this change we could then reorder parameters to
make some sense!
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