These methods were generated when rendering the ListBox and with the id
of the ListBox in their name. However, a customer reported the following
problem on Accounting Periods ListBox:

  1. Display Accounting Period ListBox on ZEO-1.
       => The ListBox will be rendered and 'listbox_period_list_*' methods will be generated on ZEO-1.
  2.  Click on 'Next Page' button and the user is redirect to ZEO-2 where the ListBox has never been generated.
       => The method does not exist yet and thus a 404 error is raised.

Instead of having one method per ListBox ID, only one is now created (eg
listbox_setPage() for SelectionTool.setPage()) at Zope startup and the
ListBox ID previously defined in the method name is now defined in the
value attributes of the buttons.