Validate the sanity of the config numbers (duration <= search_length)

[dala318]

The configuration numbers are not really aware of each others, that means that the settings could end up as if no valid range is possible.
For the moving planner this is no big deal as it will very likely result in that the planner is always on (there is only one possible duration and obviously it will be the cheapest (and most expensive) )
But when adding a static planner it becomes more relevant (or maybe not, does it only mak the window span over midnight, have to think a bit more about it...)