WIP: DIBS authentication and recording order events.

- Now order events are recorded and dispayed
  on the order status page.
- Working on getting authentication of DIBS return
  parameters right.
Authentication of DIBS response

- Added authentication of DIBS response to an authorization. This
  included having to change currency values (e.g. DKK) to currency
  codes (e.g. 208) for DIBS to do the right MD5 sums.
- Removed the payment route since the receipt route will now handle
  both the accepturl and the callbackurl from DIBS.
- Added a simple cancel page supposed to handle cancellation from
  DIBS.