split off `org-old-mu4e.el' for backward compatibility

For now this is just a copy of org-mu4e.el (which requires org-mode
8.x), but the expectancy is that they will diverge.

mu4e/org-mu4e.el

@@ -1,5 +1,6 @@
-;;; org-mu4e -- Support for links to mu4e messages/queries from within org-mode,
-;;; and for writing message in org-mode, sending them as rich-text
+;;; org-mu4e -- Support for links to mu4e messages/queries from within
+;;; org-mode, and for writing message in org-mode, sending them as
+;;; rich-text
 ;;
 ;; Copyright (C) 2012 Dirk-Jan C. Binnema
 
@@ -27,6 +28,10 @@
 
 ;;; Code:
 
+
+;; The expect version here is org 8.x
+
+
 ;; the 'noerror is just to make sure bytecompilations does not break...
 ;; FIXME: find a better solution
 (require 'org nil 'noerror)