Get rid of a couple more context object references, fix some markup and clarify what happens when a generator context function swallows an exception.

Finish bringing SVN into line with latest version of PEP 343 by getting rid of all remaining references to context objects that I could find. Without a __context__() method context objects no longer exist. Also get test_with working again, and adopt a suggestion from Neal for decimal.Context.get_manager()

guillemets; no need for magic here

- use UTF-8 output
- not mess with the >>> prompt!

experiencing.  (This code and mailbox.py itself are full of calls to file()
that should be calls to open() -- but I'm not fixing those.)

caller becomes the owner of that reference).

discussion.
There are two places of documentation that still mention __context__:
Doc/lib/libstdtypes.tex -- I wasn't quite sure how to rewrite that without
spending a whole lot of time thinking about it; and whatsnew, which Andrew
usually likes to change himself.

Replaced my dumb way of calculating seconds to midnight with Tim Peters' much more sensible suggestion. What was I thinking ?!?

The problem was that pyconfig.h was being included before some system headers
which caused redefinitions and other breakage.  This moves system headers
after expat_config.h which includes pyconfig.h.

weakref.WeakKeyDictionary and weakref.WeakValueDictionary

in turn matches Microsoft's documentation).
Drop unused parameter in CAB.append.