#9 Improve dgtnixVirtualBoard (2)

[Pierre Boulenguez]

make dgtnixVirtualBoard aware of the engine deconnection . In practice, on just have to check if the socket is still connected, however, the virtual board spend the most of it's time in sys.readLine() so a think that this would require a simple thread that do the isConnected() testing.

[Pierre Boulenguez]

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this has been implemented