* add support for org-mode links to messages/queries

- org-mu4e.el: add "mu4e:"-link type and handlers to org-mode
  - Makefile.am: add org-mu4e.el to package
  - mu4e-hdrs.el: register handler functions for server data *outside* header
    mode, so they can be used independently (and we can link to messages even
    when mu4e is not active already)
  - mu4e-view.el, mu-server.1, mu-proc.el, mu-cmd-server.c: support viewing
    messages by msgid (rather than only by docid); document it

emacs/Makefile.am

@@ -1,4 +1,4 @@
-## Copyright (C) 2008-2011 Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
+## Copyright (C) 2008-2012 Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
 ##
 ## This program is free software; you can redistribute it and/or modify
 ## it under the terms of the GNU General Public License as published by
@@ -35,6 +35,7 @@ elisp_DATA=			\
 	mu4e-view.el		\
 	mu4e-proc.el		\
 	mu4e-send.el		\
-	mu4e-version.el
+	mu4e-version.el		\
+	org-mu4e.el
 
 EXTRA_DIST=$(elisp_DATA)