test_socketserver failures on several platforms.

tests which are deemed more important issues, the second those which are
known to have difficult to solve problems and are generally expected to
leak.  Hopefully this doesn't break the script...

Update the leaky tests (ie, ignore these tests if they report leaks).  This version has been running for a while.

with all other test files). Written for GHOP by Benjamin Peterson.

Written for GHOP by Martin Matejek.

instances.

http://mail.python.org/pipermail/python-dev/2008-January/076626.html and issue
1965.

in the same code unit. The fix is essentially the same as the fix for a
previous bug identifying 0. and -0.

this patch to py3k.

also noticed and fixed a bug in Rational's forward operators (they were
claiming all instances of numbers.Rational instead of just the concrete types).

answer if the input iterable had a duplicate element
(two calls to toggle() reverse each other).  Borrow
the correct code from sets.py.