Fix physics UI

Normand Briere

2019-08-06 b3ae4e889872ca0b9ca76f1d17b2f0b961226729

 timeflow/app/actions/EditSourceAction.java
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@@ -17,7 +17,7 @@
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 	@Override
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 	public void actionPerformed(ActionEvent e) {
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-		TFModel model=getModel();
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+		TimeflowModel model=getModel();
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 		String source = (String)JOptionPane.showInputDialog(
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                 app,
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                 null,