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Here's a new version of the patch.  This takes birkenfeld's
changes into account, adds more tests and documentation, and
adds four more attributes to the result objects: username,
password, hostname, and port.  These provide access to
parsed-out portions of the netloc component.  These are
computed on demand only.

Much of this patch was written independently, but I've taken
the previous patches into consideration to make sure I
didn't miss anything already accounted for.

I think this is good for 2.5 still, and will commit this
weekend if there are no objections.