Show order details when selected

[wvengen]

When an order is selected in the filters (or via the URL), show order details above the articles.

This could show:

• supplier name
• supplier homepage link
• when the order will be closed
• pickup date
• minimum order quantity & current order amount

Especially the minimum order quantity and current order amount is important to show, and it is not shown elsewhere when using foodsoft-shop (see also #7).

[wvengen]

Right now orders are fetched only once. Since current order amount can change with each order modification, it needs to be updated. That could happen as follows: when an order is selected (and the order details will be shown with the current order amount), re-fetch the selected order and update it in the store (updating the entry in the list of orders).