Merge branch 'master' into core-updates

NEWS

build-aux/list-packages.scm

doc/guix.texi

gnu/packages/fontutils.scm

gnu/packages/gnupg.scm

gnu/packages/mail.scm

gnu/packages/maths.scm

gnu/packages/package-management.scm

gnu/packages/scheme.scm

gnu/packages/xorg.scm

gnu/packages/zile.scm

gnu/system/dmd.scm

gnu/system/linux.scm

gnu/system/vm.scm

guix/packages.scm

guix/scripts/package.scm

nix/guix-register/guix-register.cc

po/eo.po

tests/guix-package.sh

tests/guix-register.sh