Following m-p-d, a more involved default output directory
structure is feasible now:

  ~/out/name/date/name-date-arch.type

instead of plain

  ~/out/name-date-arch.type

This particular behaviour can be achieved by passing
SORTDIR='$(IMAGE_NAME)/$(DATE)'; note the single quotes.

Reports are also saved in this resulting structure
albeit the place is still highly debatable.