…uires no mongo)

This allows to properly update them during imports. Currently, we were using the
code field for OFF products but e.g. USDA products have their own id

Also, add some error handling for missing folders, urls, etc.

…r models

…sda-products

# Conflicts:
#	wger/nutrition/management/commands/import-off-products.py

Now it is possible to import the OFF dumps or delta files directly from the
JSONL files, without needing to import them to mongoDB

This can run automatically once per day if configured

This is specially important if we regularly import the delta files, since these
can have bad quality. We will probably need to add a bit more before putting
this live

…nto feature/import-usda-products

# Conflicts:
#	wger/nutrition/off.py

Also, make sure just rename the field and don't accidentally nuke the fibre field ;)

Needed because the change of "fibres" to "fiber"

This reverts commit e3214eb.

Ingredients / products will only be imported through automatic processes. We
should just point users in case of missing products to Open Food Facts, and not
handle this on our side. Admins can still add entries if they want.