* thunar/thunar-column-editor.c, thunar/thunar-preferences-dialog.c,
	  thunar/thunar-gtk-extensions.{c,h}, thunar/thunar-location-dialog.c,
	  thunar/thunar-permissions-chooser.c, thunar/thunar-create-dialog.c:
	  Add helper function thunar_gtk_label_set_a11y_relation(), which sets
	  up the ATK_RELATION_LABEL_FOR for a label and a widget, so we don't
	  need to repeat the same code over and over again.




(Old svn revision: 22937)