Zile and minimal systems

[Ludovic Courtès]

Hi!

Commit da40d07066096a3b5a852041ea01fbb32240deda updates Zile, but this
new version seems to have little in common with previous ones.  In
particular, it has more dependencies and a larger footprint:

--8<---------------cut here---------------start------------->8---
$ guix size zile | tail -1                  # before
total: 85.7 MiB
$ ./pre-inst-env guix size zile | tail -1   # after
total: 126.2 MiB
--8<---------------cut here---------------end--------------->8---

Should we provide another Emacs clone in the installation image and in
‘%base-packages’?

‘zile-on-guile’ is tempting but currently unmaintained.  ‘mg’ could work too.

Thoughts?

Ludo’.