#804524 by Dave Reid, frankcarey: Changed path_redirect_save() so that $redirect is passed by reference.

#849222 by adaddinsane, Dave Reid: Stop redirect processing if the MAINTENANCE_MODE constant is defined.

#648500 by kmonty, mrfelton | Dave Reid: Fixed 'You cannot override existing paths' error presented for paths that do not exist.

by Dave Reid: Added redirect path auto-completion and fun local task 'Add redirect to this location' on every non-admin page.

by Dave Reid: Changed theme_path_redirect_admin_list_by_path() to theme_path_redirect_list_redirects() for re-use.

by Dave Reid: Fixed query string matching with path_redirect_compare_array() and added path_redirect_build_url() for simplification of listing pages.