Report the evolution of Emacs Lisp sources.

[A Soare]

In this moment, the only method to see how the code of emacs evaluated is 
`diff'.

One can show the differences, by comparing the internal representation of the 
lisp code tree of 2 versions. I saw this idea for the C code here: 
http://www.cs.umd.edu/~mwh/papers/evolution.pdf .

An advantage of this method would be to report only one when the name of a 
variable changes. This method will also ignore to report the null-effect 
characters like blanks or empty new lines. diff reports everything.

What do you think, it would be useful such a tool to make reports of lisp code 
changes? Maybe I will try it, but it might be _realy_ useful?



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