Updated versions of asyncore/asynchat

[Andrew Kuchling]

I've reconciled the slight divergence between the versions of
asyncore.py and asynchat.py in Sam's distribution and the Python CVS
tree. The Python tree uses outdated versions, but it also added
module docstrings and fixed a typo in a comment.

Sam, could you please get the updated versions of the files from
http://www.mems-exchange.org/software/files/working/ ? They make no
code changes at all, simply the docstring and comment changes. (I can
make a patch if you like.) I'll also submit a Python patch to update
the modules.

--amk