new redirection codes

Hi,

lynx only supports the old 301/302 redirection codes,
not the new 307/308 ones whose semantics are more useful;
unsure (I’ve not tested it) whether 303 is supported right.

301/302 may change the request method from POST to GET
(IIRC lynx asks interactively which is good), whereas
308/307 (in this order) are the same but require the client
to resend exactly the same request to the redirection target.

There’s more explanation and a short summary of the other
codes in both answers (together) of
<https://stackoverflow.com/q/42136829/2171120> for reference.

Please add support for 307/308 to the next lynx (basically
same as the existing redirect sans the interactive question).

Thanks in advance,
//mirabilos
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