* new function
  Allows one to exit a special code block editing mode, save the file,
  tangle all code blocks and then re-enter the code block editing
  mode.

#+begin_src emacs-lisp
(fset 'esf/org-save-tangle-reedit-macro
   (lambda (&optional arg) 
     "Keyboard macro." 
     (interactive "p") 
     (kmacro-exec-ring-item (quote ("'t'" 0 "%d")) arg)))
#+end_src