Don't store the payment url for docdata webmenu.

The url can't be used after the payment attempt and it can be regenerated based
on the information in the models. Therefore, there's no reason to store it.
Bug fixes for status updates from DocData.

BB-285 #resolve
Add configuration to log payment status changes from DocData.

BB-282 #resolve
Don't create a docdata payment order in update_payment_status().
Don't use spaces in merchant_order_reference.
Merge pull request #281 from benkonrath/a-lattice-with-status

A lattice with status