[arch-general] `base` group replaced by mandatory `base` package - manual intervention required

[John Crist]

> Sounds good to me - do you have a suggested list of packages for
> base-extras or at least the list of what was pulled from the old base.

Here's a diff of what was in the `base` group vs what is now in the 
`base` metapackage:

$ comm -23 <(pacman -Sgq base | sort) <(expac -S "%D" base | tr -s " " "\n" | sort)

cryptsetup
device-mapper
dhcpcd
diffutils
e2fsprogs
inetutils
jfsutils
less
linux
linux-firmware
logrotate
lvm2
man-db
man-pages
mdadm
nano
netctl
perl
reiserfsprogs
s-nail
sysfsutils
texinfo
usbutils
vi
which
xfsprogs