Update contrib/README and some comments/messages

* org-faces.el (org-column): Update docstring.
* org-colview.el: Update error message.

contrib/README

@@ -52,6 +52,12 @@ org-velocity.el          --- something like Notational Velocity for Org
 org-wikinodes.el         --- CamelCase wiki-like links for Org
 org2rem.el               --- Convert org appointments into reminders
 orgtbl-sqlinsert.el      --- Convert Org-mode tables to SQL insertions
+org-favtable.el          --- Lookup table of favorite references and links
+org-mew.el		 --- Support for links to Mew messages
+org-vm.el		 --- Support for links to VM messages
+org-wl.el		 --- Support for links to Wanderlust messages
+org-w3m.el		 --- Support link/copy/paste from w3m to Org-mode
+org-colview-xemacs.el	 --- Column View in Org-mode, XEmacs-specific version
 ox-confluence.el         --- Confluence Wiki Back-End for Org Export Engine
 ox-deck.el               --- deck.js Presentation Back-End for Org Export Engine
 ox-groff.el              --- Groff Back-End for Org Export Engine

lisp/org-colview.el

@@ -36,7 +36,7 @@
 (declare-function org-clock-sum-today "org-clock" (&optional headline-filter))
 
 (when (featurep 'xemacs)
-  (error "Do not load this file into XEmacs, use `org-colview-xemacs.el'"))
+  (error "Do not load this file into XEmacs, use `org-colview-xemacs.el' from the contrib/ directory"))
 
 ;;; Column View
 

lisp/org-faces.el

@@ -202,7 +202,7 @@ set the properties in the `org-column' face.  For example, set
 
 Under XEmacs, the rules are simpler, because the XEmacs version of
 column view defines special faces for each outline level.  See the file
-`org-colview-xemacs.el' for details."
+`org-colview-xemacs.el' in Org's contrib/ directory for details."
   :group 'org-faces)
 
 (defface org-column-title