ENH: Extend the DisplayHook.compute_result_repr() and write_result_repr() methods to produce and consume the lists of extra formats. Use this capability in the ZMQ shell. Document the extension to the messaging format.
ENH: Extend the DisplayHook.compute_result_repr() and write_result_repr() methods to produce and consume the lists of extra formats. Use this capability in the ZMQ shell. Document the extension to the messaging format.