Ask what to do with unchecked items when archiving

[JakoD]

When archiving a shopping list, which still contains items that are not checked, it would be nice if the app would ask what to do with them.
Options would/could be:

• move to new list; behaavior: create new list with same name and all the unchecked items, archive the old list, but only the checked items
• mark as checked; behavior: mark all the unchecked items as checked, the archive as is done now
• (optional) keep as is; behavior: the current behavior