o Added support for reading internal children declaration in the catalog
   o Added GWA base class get_internal_child implementation using gtk_buildable_get_internal_child()
   o Create internal children as specified in catalog in glade_widget_adaptor_post_create()
     before calling deep_post_create() and post_create() methods
   o new API glade_widget_adaptor_has_internal_children()
     glade_widget_adaptor_get_internal_children()

 * gladeui/glade-widget.[ch]:
   o Made GladeWidget::reason property readable
   o Added new API glade_widget_find_child()

 * plugins/gtk+/glade-gtk-action-widgets.[ch]:
   o reworked code from GtkDialog support to read and write widget actions special tags
     found in GtkDialog and GtkInfoBar widgets

 * plugins/gtk+/glade-gtk-info-bar.c: support code for reading and writing GtkInfoBar special tags

 * plugins/gtk+/glade-gtk.c:
   o Removed GtkBox, GtkDialog, GtkComboBox and GtkTreeView unused get_internal_child functions
   o Removed creation of internal children of GtkDialog, GtkColorSelectionDialog,
     GtkFontSelectionDialog, GtkComboBox and GtkTreeView.
   o Implemented GtkDialog action-widgets tag support using common code.

 * plugins/gtk+/gtk+.xml.in:
   o Added support for GtkInfoBar widget.
   o Defined internal children of GtkDialog, GtkColorSelectionDialog,
     GtkFontSelectionDialog, GtkComboBox, GtkInfoBar and GtkTreeView.

 * gladeui/glade-xml-utils.h: Added GLADE_TAG_INTERNAL_CHILDREN and GLADE_TAG_ANARCHIST tags

 * plugins/glade-catalog.dtd: added new syntax to catalog description