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.

quite some content to move over from the pysqlite manual, but it's a start now.

Some ElementTree fixes: import from xml, not xmlcore; fix case of module name; mention list() instead of getchildren()

- markup adjustments
(there is clearly much to be done in this section)

Patch #1464708 from William McVey: fixed handling of nested comments in mail
addresses.  E.g.

"Foo ((Foo Bar)) <foo@example.com>"

Fixes for both rfc822.py and email package.  This patch needs to be back
ported to Python 2.3 for email 2.5.

UNIX platforms.

Fix another problem in inspect: if the module for an object cannot be found, don't try to give its __dict__ to linecache.

On the way, add a decorator to test_support to facilitate running single
test functions in different locales with automatic cleanup.

find a better place for the link to it than alongside bsddb & friends.

add expat_config.h.

possibly "rounding up" to the next whole second.