2006-11-08  Lukasz Zalewski  <lukas@dcs.qmul.ac.uk>

        More changes related to bug #352924.
        * gui/gdmsetup.c: Made warnings more self-explanatory when no themes
          are selected in "Random from selected" mode. Enabled back the delete
          button on the "Random from selected" view for the currently selected
          theme in the single theme view with a slight modification - users can
          click on it but get told that they need to first deselect it from
          "Single theme" mode first in order to delete it. Also upon closure if
          users have activeted "Random form selected" but have not selected any
          themes for it, they will be informed that the greeter will default to
          single theme mode.