2006-10-18  Murray Cumming  <murrayc@murrayc.com>

        * glom/mode_data/dialog_layout_list.cc:
        * glom/mode_data/dialog_layout_list.h: Remove warn_about_images()
        and don't use it in on_button_add_field() and on_button_edit_field().
        * glom/utility_widgets/imageglom.cc:
        * glom/utility_widgets/imageglom.h: Make scale_keeping_ratio() public,
        so we can use it from elsewhere, and check for null pixbufs.
        * glom/utility_widgets/db_adddel/db_adddel.cc: treeviewcolumn_on_cell_data():
        Show pixbufs too, so that Image fields show up in the list view too.