Improve RFC 3986 conformance of url package.

Fix 2012-04-10 change to url.el.

* url-http.el (url-http-create-request): Ignore obsolete
attributes slot of url-object.

* url-parse.el: Improve RFC 3986 conformance.
(url-generic-parse-url): Do not populate the ATTRIBUTES slot,
since this is not reliable for general RFC 3986 URIs.  Keep the
whole path and query inside the FILENAME slot.  Improve docstring.
(url-recreate-url-attributes): Mark as obsolete.
(url-recreate-url): Handle missing scheme and userinfo.

* url-util.el (url-encode-url): New function for URL quoting.
(url-encoding-table, url-host-allowed-chars)
(url-path-allowed-chars): New constants.
(url--allowed-chars): New helper function.
(url-hexify-string): Use them.

* url-vars.el (url-nonrelative-link): Make the regexp stricter.

* url.el (url-retrieve-internal): Use url-encode-url.

Fixes: debbugs:7017

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