These AtkRelation types are added automatically for widgets with a label
specified (e.g. via gtk_label_set_mnemonic_widget, gtk_frame_set_label,
and gtk_frame_set_label_widget). When such specification is absent, the
accessible relationship must be manually set.
https://bugzilla.gnome.org/show_bug.cgi?id=726996
Add printer_compare() function for comparing printers according
to their names and locations. It is possible to search by multiple
keys separated by space or tabulator using logical conjunction.
Based on patch by William Hua.
https://bugzilla.gnome.org/show_bug.cgi?id=692931