----------------
- assertXpathCount now also takes ints (7681).
- API expansion: add ``isChecked`` to verify checkboxes, ``runScript``,
``clickAt``, ``getLocation``, ``getSelectedValue``, ``getSelectedIndex``.
- The ``pause`` method uses float division now. Pauses where implicitly rounded
to full seconds before when an int was passed.
- The name of the factored test layer contains the module of the bases now. The
name is used by zope.testrunner distinguish layers. Before this fix selenium
layers factored from base layers with the same names but in different modules
would be considered equal by zope.testrunner.
- The factored ZTK layer cleanly shuts down the http server in tearDown now.
This allows to run different selenium layers in one go.