fr33domlover/haskell-persistent: My patches to the Haskell persistent library @ insertby

fr33domlover 8788807048 Atomic insertUnique in SqlBackend and PostgreSQL 9.5+ support		5 lat temu
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Persist	8788807048 Atomic insertUnique in SqlBackend and PostgreSQL 9.5+ support	5 lat temu
Persist.hs	a3eed2f7c5 Cleanup of pragmas, imports and dependencies (#888)	5 lat temu