improve check case 04 impact

I do not really know, what test case 4 is supposed to check, but the case could cover more than it does so far:

• share common L0 data (only works in current settings for version 5.x) -> reordering of domains
• multiple different land cover periods -> change simulation periods
• all routing/hydrology resolution combinations

I would propose this for version 6.x, what do you think @muellese?