title: in Vimscript (vimL) how do I augment a library's function?
body: <p>I have an autoload vim script library that I've gotten form vim.org.  I don't want to change it directly but want to put something in my vimrc that augments one of the functions in that library so that whenever that function is called in that library, my function also gets called.  How do I do that?</p>