* gladeui/glade-widget-adaptor.c: added some extra checks in 
  glade_widget_adaptor_action_add_real()

* plugins/gtk+/glade-gtk.c: added new actions support code
  - glade_gtk_box_notebook_child_insert_action() renamed to
    glade_gtk_box_notebook_child_insert_remove_action()

  - glade_gtk_table_child_insert_action() renamed to 
    glade_gtk_table_child_insert_remove_action()

* plugins/gtk+/gtk+.xml.in: added new actions

  - GtkTable remove_row and remove_column

  - GtkNotebook remove_page

svn path=/trunk/; revision=1348