Completely get rid of StringIO.py and cStringIO.c.
I had to fix a few tests and modules beyond what Christian did, and
invent a few conventions. E.g. in elementtree, I chose to
write/return Unicode strings whe no encoding is given, but bytes when
an explicit encoding is given. Also mimetools was made to always
assume binary files.
Mark Dickinson
Georg Brandl
Collin Winter
Guido van Rossum
Tim Peters
Martin v. Löwis
Jeremy Hylton