chore: Tidy imports

And reports are sorted by date.
And assumed disease prevalence is set to medium, not low.

Can be called with command line flag '-p Scraper'.
To use, the config file requires the following minimal entry (with
URL for South Asia):
    "Scraper" : {
	    "ProcessPreJob" : "do_nothing_return_true",
        "ProcessInJob" : "process_in_job_media_scraper",
        "ProcessEWSPlotting" : "do_nothing",
        "seasonStartString" : "20220101",
        "URL" : "https://arrcc-viewer.onrender.com/assets/sample_data/data.zip"
    },