Test + Rebate + Delivery

This release includes:

• Deduce from total price: 10% discount for orders over 300 DKK
• Nudge user to choose a more expensive product if available for upsell
• Let user enter a delivery address and a billing address if different
  • country, limited to "Denmark" for now
  • zip code, if Denmark, validate against https://api.dataforsyningen.dk/postnumre
  • city, if Denmark provide automatically from zip code
  • address line 1 and 2
  • name
  • phone, if Denmark, validate as 8 digits
  • email, validate as valid email address
  • company name
  • company VAT number, if Denmark, validate as 8 digits
• Automated tests for some of the relevant scenarios