Action output argument should not be called "Action"

[nicolasdemauroy]

It generates compile error by having to getActionRef methods. ACTION should be forbidden as name of an action input or output argument.

	public ActionRef getActionRef() {
		return new ActionRef();
	}

	public SActionOutputDataRef<TextDataEltType> getActionRef() {
		return ActionExecution.getActionOutputDataRef("ACTION",new TextDataEltType(),1);
	}