Fix random/switch node.

Normand Briere

2019-05-01 d1e1417edc8a6ccf195b6da3270f22234dda61e4

 timeflow/format/file/Export.java
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@@ -6,5 +6,5 @@
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 public interface Export {
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 	public String getName();
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-	public void export(TFModel model, BufferedWriter out) throws Exception;
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+	public void export(TimeflowModel model, BufferedWriter out) throws Exception;
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 }