Fix timeflow examples.

Normand Briere

2019-04-24 92e4487d01f910c705211ffb5762a5c96bdd6d8c

 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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 }