Agenda: Fix remote editing of priorities from agenda.

There was a bug when the entry to be edited was invisible.

lisp/ChangeLog

@@ -1,5 +1,7 @@
 2009-02-20  Carsten Dominik  <carsten.dominik@gmail.com>
 
+	* org.el (org-priority): Also find invisible heading.
+
 	* org-colview-xemacs.el (org-columns-edit-value): No special
 	treatment for `org-todo' prefix.
 

lisp/org.el

@@ -9580,7 +9580,7 @@ ACTION can be `set', `up', `down', or a character."
   (setq action (or action 'set))
   (let (current new news have remove)
     (save-excursion
-      (org-back-to-heading)
+      (org-back-to-heading t)
       (if (looking-at org-priority-regexp)
 	  (setq current (string-to-char (match-string 2))
 		have t)