bug#2452: Mention Zile in Emacs documentation

[Reuben Thomas]

Hi,

I'm the maintainer of GNU Zile. Zile Is Lossy Emacs. Zile is a lightweight, 
portable Emacs clone. Its only purpose is to stand in for Emacs when for one 
reason or another Emacs won't do: for example, it won't install on a given 
platform, or takes too much memory or disk space, or starts up too slowly.

Ideally, Zile wouldn't exist. But while it does, it would be nice if it 
could be mentioned in Emacs's documentation, as many Emacs users have found 
it useful over the years (including myself, which is why I started to use 
Zile) and many more may yet do so.

--
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