Split configuration of `wu` databases
Split configuration of `wu` databases

Now, both parts (atlantis, helios) are only initialized when the
coresponding `…HOST` configuration variable is set.

MarauderXtreme/sipa,agdsn/sipa,MarauderXtreme/sipa,agdsn/sipa,lukasjuhrich/sipa,lukasjuhrich/sipa,MarauderXtreme/sipa,agdsn/sipa,lukasjuhrich/sipa,lukasjuhrich/sipa,agdsn/sipa