parsedate_tz(): Return a 1 in the tm_yday field so that the value is

parsedate_tz(): Return a 1 in the tm_yday field so that the value is
acceptable to Python 2.4's time.strftime().  This fix mirrors the behavior in
email 3.0.  That field is documented as being "not useable" so it might as
well not be buggy too <wink>.

Add a test for this behavior and update a few tests that were expecting a 0 in
this field.  After committing I will run the entire Python 2.3 test suite to
ensure this doesn't break any Python tests.