Object-oriented FlowClient?

[jc-harrison]

I wonder whether it would be worth implementing a Query class in FlowClient, which contains a query specification along with a run method, and status and result properties. The flowclient functions that currently return a query spec could instead return a fllowclient.Query object.

My feeling is that this might be more intuitive for users, would remove the need for them to deal directly with query IDs, and may help to avoid confusion between query specifications and query results.