Complete refactoring of orders-workflow.

OrderResult tables are removed. Data consistency is now possible through new article.price-history (ArticlePrice).
Balancing-workflow needs to be updated.

test/fixtures/article_prices.yml

@@ -0,0 +1,27 @@
+# == Schema Information
+# Schema version: 20090120184410
+#
+# Table name: article_prices
+#
+#  id            :integer(4)      not null, primary key
+#  article_id    :integer(4)
+#  price         :decimal(8, 2)   default(0.0), not null
+#  tax           :decimal(8, 2)   default(0.0), not null
+#  deposit       :decimal(8, 2)   default(0.0), not null
+#  unit_quantity :integer(4)
+#  created_at    :datetime
+#
+
+# Read about fixtures at http://ar.rubyonrails.org/classes/Fixtures.html
+
+one:
+  price: 9.99
+  tax: 9.99
+  deposit: 9.99
+  unit_quantity: 1
+
+two:
+  price: 9.99
+  tax: 9.99
+  deposit: 9.99
+  unit_quantity: 1