Include department, salutation, city and country in the address comparison and display all these fields, too

Before this commit, the address comparison in the backend order details did not include the departments, salutations, cities and countries of the billing and shipping addresses. However, we identified many cases where some customers change one or more of these fields on purpose, to e.g. get around certain country restrictions or just because the invoice should be sent to a different department within the same company. Therefore it is important to compare all fields of the address. This commit adds the missing checks. Additionally it displays the departments and salutations in the order overview to make the applied comparison comprehensible to the user.