fix(syntax): make Position's Ord match Eq - #1395
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Ord compared offset only while Eq was derived over offset, line, and column, so two positions could be unequal and still compare Equal. Derive Ord/PartialOrd so the total order agrees with Eq. Fixes rust-lang#1393
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`Position`'s `Ord` compared `offset` only, while `Eq` was derived over offset, line, and column. Two positions with the same offset and different line/column were unequal but compared `Equal`, which breaks `BTreeSet`/`BTreeMap`.
Derive `Ord`/`PartialOrd` so the total order agrees with equality.
Fixes #1393