Use LongObjectOpenHashMap instead of HashMap<Long, Object>
Use LongObjectOpenHashMap instead of HashMap<Long, Object>

this saves quite a bit of RAM and could be slightly faster.
This NNSearcher doesn't work with the old GraphSerializer because it's not
serializable but this class is expected to get removed.

ToureNPlaner/tourenplaner-server,ToureNPlaner/tourenplaner-server,ToureNPlaner/tourenplaner-server,ToureNPlaner/tourenplaner-server