- SKS update searches should be attached to individual search results, not to the
entire SKS search (!)
=> API change (event signalling) & serialization change (!)
- => update search results should be stored in different result directory due
- to possibility of naming conflicts!
- => outch: ditto for recursive downloads (!)
- persistence testing (publish, unindex, search, download):
=> need driver!
=> schedule suspending tasks DURING event handler => good coverage!