PFA patch which allow user to configure how many rows they wish to display for any pgagent jobs on statistics panel.
I think this is essentially good, however, I'm really not happy with the preference name and category. In general, I'd suggest that before creating patches in the future we should confirm naming etc on the mailing list, as I often end up changing wording and then requiring new screenshots etc.
Ok
In this case, I really don't like that we've added another category, and quite a specific one at that. I would suggest we move it to Browser -> Properties and name it "Maximum job history rows" with a description of "The maximum number of history rows to show on the Statistics tab for pgAgent jobs."
