bug#19556: eww: make URI rewriting fully customizable

[Ivan Shmakov]

>>>>> Eli Zaretskii <eliz@gnu.org> writes:
>>>>> From: Ivan Shmakov  Date: Sun, 11 Jan 2015 18:22:22 +0000

 >> What about президент.рф?

 >> … Well, right, – Emacs by itself doesn’t seem to offer IDN support
 >> right now, but I guess that will change.  Eventually.

 > There's already idna.el, and Emacs uses it when it's available.

        Indeed, I’ve seen references to idna.el under lisp/gnus/, but
        neither any references to it outside of that directory, nor
        idna.el itself in the Emacs tree.  I thus presume the latter is
        supplied by GNU Libidn, and not GNU Emacs itself.

        In relation to my comment above, I see no mention of IDN under
        lisp/url/ or in lisp/net/eww.el.

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