Correct OffsetFinder to handle "new" SubQuery support #683
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Offsetfinder is responsible to detemrine that the "tree" we are working on is at the same time offset. With the addition of SubQuery you can actually have an entire sub-tree at its own offset. Since subquery support was added (#246) we can actually allow NodeReplacer to run assuming the top of the tree is a SubQuery -- as we will "expand" it into its own tree.
Fixes #678