Undo/redo fully working

Normand Briere

2019-06-11 1d909ffa0c2beb51d453b53b845c4f3a749ca5f0

 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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 }