free()ing the memory we allocate.

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.)