Rudder

Now that workflows are more or less stabillized, we have a far better view about what we need and what should desapear.

Some requirement not fulfullid:

- "workflow enabled" properties should be use at one point only
- in [WR]oChangeRequestJdbcRepository, we should not use Try to immediatly test for success
- we don't want to use Box.Empty
- in other data access layer, logs are done in the repository, not in the service. We should do the same here.