Hello,

This patch adds a 'relpath' function to module os.path
as per RFE #1309676 and also this thread:
http://mail.python.org/pipermail/python-dev/2005-September/056709.html

Here's a description of this function:
"relpath(path, start=os.curdir) 
Return a relative filepath to 'path' either from the
current directory or from a specified 'start' point."

This patch includes Windows and *nix versions. 
It has been tested on Windows XP and OS/X 10.4.

Note: there is no 'classic mac' version as I don't know
that platform :-(

Changed files are: 
lib/ntpath.py 
lib/test/test_ntpath.py 
lib/posixpath.py 
lib/test/test_posixpath.py

I'll send a second patch for the documentation shortly.

As this is my first submission please be gentle with me
if there are any basic errors :-)