Turbo lister not updating store categories

Shade the background of empty Return Policy options to indicate not required.

When revising a listing with quantity 1, ask for quantity on hand. When revising item, include image changes made to stock item.

Change URL for viewing listing so lines are not cramped.

Country code set wrongly on reauthorisation, should be GB not UK.

Avoid tagging Error 240 as one that Listomax should have handled better.