dvc: revert checkout to be silly and fast, relink on dvc add though #2882
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This fixes #2492, reverts #2358 and fixes #2016 other way.
So now:
dvc checkout
does not relink unless out is changeddvc add/run
always relinks, but slow unneeded copy is not madeI left @pared checkout tests and marked them as skipped to be reused later to test
--relink
.