Message 97060 - Python tracker

Here is a patch for py3k. It uses the same contents as before but with
changes to the str/bytes wording on getch_doc, putch_doc, and
ungetch_doc. Includes updates to the msvcrt.rst file. Let me know if the
wording seems correct (or if I left anything out).

I went ahead and added docstrings to the debug-only functions as a bonus.