Enter all the meals of the calendar in advance

[lauramarec]

As a Meals-on-Wheels Manager I would like to be able to enter all the meals of the calendar in advance per day so that we can prefill the proper recipe when generating the kitchen count.

Acceptance criteria

• I can associate one and exactly one meal per day
• I can view the list of upcoming meals

Notes

It seems that there is already a Menu datastructure that holds this information. The admin interface already allows entering menus in advance. When creating manually a Menu entry in the admin interface, the proper thing seems to happen: the kitchen count interface displays the meal entered in the menu, and after the ingredients are confirmed, the Menu gets updated in the database with the proper information. We should edit the admin interface to make it easier to see past and upcoming menus with their components, and this should complete the feature.