Jalview code should not call addNotify()

Several classes in Jalview call addNotify(). This is strongly disrecommended, and in particular it is happening in AlignmentPanel before it can be laid out. This method is supposed to indicate that resources have been attached -- that the topLevelAncestor has an OS peer, allowing it access to fonts and graphics. If this is doing something important, it should be stated so in the code.