TODO

   1 ClientPutDiskDir
   2 GetPluginInfo (since 1075)
   3 PutFetchable
   4 PutSuccessful
   5 RemovePersistentRequest
   6 SubscribeUSK
   7 UnknownNodeIdentifier
   8
   9 ManageNodesDialog
  10 * prevent deletion of currently connected nodes
  11