"guix system" summary output?

[Danny Milosavljevic]

> This sample omits the most useful output, which is the summary of what
> will be done.

Just tested with the spinner so I could actually (potentially) see the summary.

It seems that "guix package" prints such a summary (yay!), but "guix system 
reconfigure" doesn't.  The latter just starts downloading stuff and then builds 
stuff - no summary anywhere:

;;; note: source file /x/home/dannym/src/guix/guix/ui.scm
;;;       newer than compiled /x/home/dannym/src/guix/guix/ui.go
guix system: warning: Your Guix installation is 476 days old.
guix system: warning: Consider running 'guix pull' followed by
'guix system reconfigure' to get up-to-date packages and security updates.

substitute: updating list of substitutes from 'https://bayfront.guixsd.org'... 
100.0%
substitute: updating list of substitutes from 'https://mirror.hydra.gnu.org'... 
100.0%
substitute: updating list of substitutes from 'https://bayfront.guixsd.org'... 
100.0%
substitute: updating list of substitutes from 'https://mirror.hydra.gnu.org'... 
100.0%
substitute: updating list of substitutes from 'https://mirror.hydra.gnu.org'... 
100.0%
updating list of substitutes from 'https://bayfront.guixsd.org'... 100.0%
updating list of substitutes from 'https://mirror.hydra.gnu.org'... 100.0%
Downloading 
https://mirror.hydra.gnu.org/guix/nar/zv7rfn8wj4g0nrjzfqgpdnibwy8rjq9q-adwaita-icon-theme-3.24.0.tar.xz
 (19.8MiB installed)...
 adwaita-icon-theme-3.24.0.tar.xz  19.8MiB 1.2MiB/s 00:16 
[####################] 100.0%

updating list of substitutes from 'https://bayfront.guixsd.org'... 100.0%
Downloading 
https://mirror.hydra.gnu.org/guix/nar/b06kc32xcs4kmidi82p4agrmnypri935-cups-2.2.1-source.tar.gz
 (9.0MiB installed)...
 cups-2.2.1-source.tar.gz  9.0MiB  1.6MiB/s 00:06 [####################] 100.0%

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