No auto-layout after user moves topic
Sometimes auto-layout produces unwanted results, in particular when there are unconnected topics in the graph.
A pragmatic solution is to disable auto-layout after user moves topic.
Auto-layout should only kick in when displaying in-map details.
Possibly this solves the situation described in #172 (comment 9818) as well. We could keep auto-panning then. Thanks to @mukil for coming up with this idea.