Merge branch 'core-updates' into core-updates-next

.dir-locals.el

Makefile.am

build-aux/run-system-tests.scm

configure.ac

doc/contributing.texi

doc/guix.texi

etc/guix-install.sh

etc/snippets/scheme-mode/guix-origin

gnu/local.mk

gnu/packages/abiword.scm

gnu/packages/admin.scm

gnu/packages/agda.scm

gnu/packages/android.scm

gnu/packages/astronomy.scm

gnu/packages/audio.scm

gnu/packages/augeas.scm

gnu/packages/aux-files/linux-libre/4.18-arm64.conf

gnu/packages/aux-files/linux-libre/4.18-i686.conf

gnu/packages/aux-files/linux-libre/4.18-x86_64.conf

gnu/packages/backup.scm