REACH-94 Node positions not updated in nwk

It's the same as "REACH-92 Wrong positions of nodes after opening a file".
It happens because Flood doesn't send messages about moving nodes, therefore in Dynamo all nodes stay where they were created. This behavior is reasonable because sending a node move message after each move would cause to slow performance.
My solution is to update node positions only before saving. It also needs changes in Dynamo (https://github.com/Benglin/Dynamo/pull/178)
@marimano - This is close to what I'm looking for, but we actually want the filename.  Tabs should read the same as in DynamoSandbox.