Message 74032 - Python tracker

As Steven Bethard proposed, here is a new version of my getcwd() 
patch: instead of adding a keyword argument "bytes", I created a 
function getcwdb():
 * os.getcwd() -> unicode
 * os.getcwdb() -> bytes

In Python2 it was:
 * os.getcwd() -> str (bytes)
 * os.getcwdu() -> unicode