* plugins/gtk+/icons/*, plugins/gnome/icons/*: Renamed all icons.

        * gladeui/glade-project-view.c, gladeui/glade-widget-adaptor.[ch],
          gladeui/glade-palette-item.c, gladeui/glade-clipboard-view.c:
          Use GtkIconTheme for loading and managing widget icons.
          New "icon-name" property on GladeWidgetAdaptor.

        * gladeui/glade-catalog: Added catalog property "icon-prefix". The
          default value of this property is set to the catalog name.

        * gladeui/glade-app.c: Add GtkIconTheme search path for widget icons.

        * plugins/gtk+/icons/16x16/Makefile.am,
          plugins/gtk+/icons/22x22/Makefile.am,
          plugins/gnome/icons/16x16/Makefile.am,
          plugins/gnome/icons/22x22/Makefile.am: Renamed icon files.

        * gladeui/glade-widget-adaptor.c: Use g_type_class_add_private().

        * doc/widgetclasses.sgml, doc/catalogintro.sgml: Update documentation.

svn path=/trunk/; revision=1237