http basic auth: reset redirect counter on new requests (issue2255)
On Python 2.6.6 (and patched 2.6.5 on certain Linux distros),
the change that caused issue2255 was also applied to non-digest
authentication; this change extends the 2ec346160783 fix
accordingly.
Remove variable output affected by length of TMPDIR.
If the temporary directory is longer than /tmp then it's possible that
the Subject line will get wrapped by the headencode function.