Drop the support level for stdwin a notch -- the contents of

lib-stdwin is no longer installed.

Increase the support level for other obsolete modules a bit: install
lib-old by default.  It still isn't in the path by default, but at
least it's easier to add to your $PYTHONPATH this way.  (This makes
sense because in 1.6 we're much more aggressive with declaring modules
obsolete.)