2005-07-14  Murray Cumming  <murrayc.com>

        * glom/data_structure/field.cc: sql(): Handle TYPE_IMAGE
        fields.
        * glom/data_structure/glomconversions.cc:
        * glom/data_structure/glomconversions.h: Add
        get_escaped_binary_data() and parse_escaped_binary_data(),
        using a a copy of the PQunescapeBytea() function from
        Postgres, because gda_value_get_binary() does not unescape
        the data yet.
        * glom/utility_widgets/datawidget.cc: Connect to the
        LayoutWidgetField signals for the ImageGlom widget.
        * glom/utility_widgets/imageglom.cc:
        * glom/utility_widgets/imageglom.h: set_value():
        Use our copy of PQunescapeBytea().
        * glom/utility_widgets/layoutwidgetfield.cc:
        * glom/utility_widgets/layoutwidgetfield.h: Added
        get_has_original_data() for later optimisation.