You might want to review this change as it's my first time.  Be gentle. :-)

request was successfully received, understood, and accepted.
Now in these cases no error is raised. Also fixed tests.

OSError if accessing a local file via the file:// protocol fails.

base64.encodestring() for encoding authentication data.
encodestring() can include newlines for very long input, which
produced broken HTTP headers.

and watch out for handler name collisions.

(fixes #1484793).

with title().

test suite.

For urllib2, move the import of gopherlib into the
only function that uses it:  users (including the
test suite) certainly shouldn't see a deprecation
warning just because they import urllib2!  If they
actually use gopher_open(), fine, _then_ they should
see a deprecation warning.

Can/should this be backported?

(John J Lee)

Minor code clarification and simplification.