Bug#892487: transition: gnome-desktop3/mutter 3.27

[Jeremy Bicha <jbicha@debian.org>]

Oh, I forgot to mention 2 things:

1. I would like to do the mutter/gnome-shell transition simultaneously
with gnome-desktop3:

https://release.debian.org/transitions/html/auto-mutter.html

All 3 affected packages need sourceful uploads. I have permission from
the budgie-desktop maintainer to do its NMU. The others are Debian
GNOME packages which I will also upload.

2. I will wait to do the libgweather transition requested at
https://bugs.debian.org/890322 later.

Thanks,
Jeremy Bicha