group orders: display deposit, tolerance only if necessary

[mjavurek]

In the current foodsoft version, it is not visible for ordergroups during ordering, if articles contain a deposit and ordergroups may think the article is more expensive. Tolerances are currently shown for all articles, even for articles without tolerance, which makes the view unnecessarily complex. This PR resolves both issues:

Tolerances and deposit are not shown if there is none of them:

An additional column is displayed for the deposit if there is at least one article in the order with deposit. This is important for the ordergroups so that they know that the price shown includes a deposit.

If there is at least one article with tolerance (unit quantity > 1), additional columns appear with tolerance information only at corresponding articles.

[mjavurek]

Todos:

• add .contains_deposit in language files

[mjavurek]

Actually, the markup is also calculated for the deposit included in the gross price:

((price + deposit) * (1+tax)) * markup

At least there should be an option to exclude the deposit from the markup, like FoodsoftConfig[:deposit_with_markup]:

(price * (1+tax)) * markup + (deposit * (1+tax))

[twothreenine]

Generally, I think those are good points. However, they will lead to merge conflicts and therefore more effort needed with #1073.

An additional column is displayed for the deposit if there is at least one article in the order with deposit. This is important for the ordergroups so that they know that the price shown includes a deposit.

I'd prefer a different approach here: The more interesting number is the price without deposit, and adding another column will have negative effects on small (mobile) screens. That's why I'd suggest showing the price without deposit instead and adding a small symbol (e.g. a bottle) next to the price of articles with deposit, with an onclick+onhover tooltip that shows the deposit, like excl. 0.50 € deposit. (since onhover only would not be mobile-friendly)
This should not affect the calculation of sum / total sum. An additional incl. deposit [in total sum] would be nice, but would also make the layout even more problematic.

Actually, the markup is also calculated for the deposit included in the gross price:

((price + deposit) * (1+tax)) * markup

At least there should be an option to exclude the deposit from the markup, like FoodsoftConfig[:deposit_with_markup]:

(price * (1+tax)) * markup + (deposit * (1+tax))

1. Can you please open an issue for this (if not already exists)? It think it should be done in a separate PR.
2. btw we also had a discussion on pricing models altogether: https://forum.foodcoops.net/t/deposit-not-counted/667/3