making run dirs be archived if running processor from __main__ (was defualt before, now requires specifying)

updating the default full integration test run date to use the latest production NAME file formats from the Met Office

splitting out logger creation in processor_base to allow processors to be called with a different logger setup (for example epi_fit)

Fix: remove Content column from output, because of the extra commas make it hard to read the files in.

adding wheat_group and wheat_group_display args to depo - this will be used when we start running different strains dynamically. For now we are hard-coding to "PROD". The "PROD" will appear in filenames, but not the image titles