Create selling model
Add selling_id to Item. Create relation between Selling and Item
add test to item model to reflect new association with selling model
create sellings controller and add sellings routes to config/routes
Create sellings controller. Finish tests for selling index page without an active event
implement basic functions for sellings index page including tests
implement SellingStatistics with tests
finish sellings index page with tests
finish cart without javascript. Selling needs refactoring in controller (remove obsolete actions like 'add_item'). Implement selling show page
finish selling show page
finish checkout of selling
finish carts index page
add menu items storno, stornos and carts to layouts/header
Add delete cart to carts page
fix test of deleting cart
implement show cart page. Delte item to be implemented
implement print selling to default printer when checking out
create LineItem
Create reversal and move items in carts and sellings to line_items
Create reversal and move items in carts and sellings to line_items