bug#16211: eww should support multiple *eww* buffers

[Ivan Shmakov]

Package:  emacs
Severity: wishlist

        EWW should support rendering Web pages in more than one buffer
        (akin to “tabs” and “windows” of many other browsers out there.)

        This could’ve been a matter of a single variable, made local
        (and non-nil) in ‘*eww*’ buffers, but as eww-render is called
        from the /data/ buffer (and not the buffer the Web page was
        requested from), it’s likely to be necessary to pass the buffer
        to eww-render explicitly, whenever it’s called via url-retrieve.

        For simplicity, eww-render may then dynamically bind some
        variable to the buffer passed, which is then to be used by
        eww-setup-buffer (instead of requesting the ‘*eww*’ buffer.)

        Then, to get a new buffer to render Web pages in, we simply
        create one, and call eww-mode from there.  (The latter flagging
        the buffer as suitable for rendering, perhaps re-using the very
        same variable as bound dynamically by eww-render above, only
        making it local to the buffer.)

PS.  And while there, why not to make the buffer names used by EWW
        customizable, BTW?

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