Emacs: Set org-refile-use-outline-path.

A true value makes a level 3 headline appear as level1/level2/level3.
Emacs: Add find-file-as-root function and binding.

This comes from emacs-fu:

http://emacs-fu.blogspot.kr/2013/03/editing-with-root-privileges-once-more.html

I should look into the ido-read-file-name function.