Replaces ChooseColumnsTransform and DropColumnsTransform with SelectColumnsTransform#1371

Merged

singlis merged 11 commits intodotnet:masterfrom

singlis:singlis/drop4

Oct 30, 2018

Commits on Oct 25, 2018

Removes ChooseColumnsTransform and DropColumnsTransform classes
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Merge remote-tracking branch 'origin/master' into singlis/drop4
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Commits on Oct 27, 2018

Commits on Oct 29, 2018

- ignoreMissing and keepHidden now default to false to follow the
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