Add Effort property to completion list.

lisp/ChangeLog

@@ -1,3 +1,8 @@
+2009-05-30  Carsten Dominik  <carsten.dominik@gmail.com>
+
+	* org.el (org-buffer-property-keys): Add Effort property for
+	completion.
+
 2009-05-28  Carsten Dominik  <carsten.dominik@gmail.com>
 
 	* org-clock.el (org-clock-sum-current-item): Fix positioning bug

lisp/org.el

@@ -11914,7 +11914,8 @@ formats in the current buffer."
       (setq rtn (append org-special-properties rtn)))
 
     (when include-defaults
-      (mapc (lambda (x) (add-to-list 'rtn x)) org-default-properties))
+      (mapc (lambda (x) (add-to-list 'rtn x)) org-default-properties)
+      (add-to-list 'rtn org-effort-property))
 
     (when include-columns
       (save-excursion