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/order_comments.yml

@@ -0,0 +1,19 @@
+# == Schema Information
+# Schema version: 20090120184410
+#
+# Table name: order_comments
+#
+#  id         :integer(4)      not null, primary key
+#  order_id   :integer(4)
+#  user_id    :integer(4)
+#  text       :text
+#  created_at :datetime
+#
+
+# Read about fixtures at http://ar.rubyonrails.org/classes/Fixtures.html
+
+# one:
+#   column: value
+#
+# two:
+#   column: value