Automatic sort Summarize tool output

[Bennu]

At a minimum one checkbox added to the Summarize tool, which would trigger the output to be automatically sorted in the order in which the fields were aggregated.

On a more elaborate level, it could allow the user to select a different sort order than that in which the fields were aggregated.

[Iggles]

This should absolutely be done. Would save space on the canvas and also time as I realise (again) I've not added a Sort tool.