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Added crude "expand" preview (up and down arrows)


NaturalHistoryMuseum/dmtx-wrappers,dmtx/dmtx-wrappers,dmtx/dmtx-wrappers,NaturalHistoryMuseum/dmtx-wrappers,NaturalHistoryMuseum/dmtx-wrappers,dmtx/dmtx-wrappers,dmtx/dmtx-wrappers,dmtx/dmtx-utils,dmtx/dmtx-wrappers,dmtx/dmtx-wrappers,dmtx/dmtx-utils,NaturalHistoryMuseum/dmtx-wrappers,NaturalHistoryMuseum/dmtx-wrappers,dmtx/dmtx-utils,dmtx/dmtx-wrappers,NaturalHistoryMuseum/dmtx-wrappers,NaturalHistoryMuseum/dmtx-wrappers,NaturalHistoryMuseum/dmtx-wrappers,dmtx/dmtx-wrappers