- Delivery.id is not persisted anymore: the file name and relaltive
directory *is* the id, and we don't want to denormalize this info
- Delivery.load will filter out non fields keys from the storage: this
allows more resilient upgrade of the data model, and is usefull when
dealing with multiple branches with different data models
- Delivery.archive/unarchive will move the delivery storage from
root to archive/
- Delivery.all now accepts "is_archived" to retrieve archived instead
of active deliveries
- import products is now moved to a modal
- archived deliveries are now listed in a separate page
