build: Require Guile >= 2.0.13.

* README, configure.ac, doc/guix.texi (Requirements): Increase minimum
Guile version from 2.0.9 to 2.0.13.
* config-daemon.ac: Remove use of 'GUIX_CHECK_UNBUFFERED_CBIP'.
* m4/guix.m4 (GUIX_CHECK_UNBUFFERED_CBIP): Remove.
* guix/build/download.scm (current-http-proxy): Remove.
* guix/build/syscalls.scm (%libc-errno-pointer, errno): Remove.
(syscall->procedure): Use #:return-errno unconditionally.
* guix/hash.scm (open-sha256-input-port)[unbuffered]: Remove outdated
comment.
* guix/http-client.scm (when-guile<=2.0.5-or-otherwise-broken): Remove.
<top level>: Remove 'when-guile<=2.0.5-or-otherwise-broken' block.
* guix/scripts/substitute.scm (fetch): Remove 'guile-version>?'
conditional.
* tests/hash.scm (supports-unbuffered-cbip?): Remove.
<top level>: Remove 'test-skip' call.

services: certbot: Allow to set a deploy hook.

* doc/guix.texi (Certificate Services): Document it.
* gnu/services/certbot.scm (<certificate-configuration>, certbot-command): Add
it.

services: certbot: Allow to set RSA key size.

* doc/guix.texi (Certificate Services): Document it.
* gnu/services/certbot.scm (<cerbot-configuration>, certbot-command,
certbot-activation, certbot-nginx-server-configurations): Add it.

doc: Fix typo in certbot-configuration description.

* doc/guix.texi (Certificate Services): Fix typo.

services: certbot: Associate one certificate with several domains.

* doc/guix.texi (Certificate Services): Document <certificate-configuration>,
the change from domains to certificates and the fact that their path is now
derived from their name.
* gnu/services/certbot.scm (<certificate-configuration>): Add and export it.
(certbot-configuration, certbot-command, certbot-activation,
certbot-nginx-server-configurations, certbot-service-type): Replace 'domains'
with 'certificates'.
(certbot-nginx-server-configurations): Use only one nginx-server-configuration
and use all certificate domains as the server-name.

services: certbot: Get certbot to run non-interactively.

* doc/guix.texi (Certificate Services): Add email field and link to the ACME
Subscriber Agreement.
* gnu/services/certbot.scm (<certbot-configuration>, certbot-command,
certbot-activation, certbot-nginx-server-configurations): Add email field.
(certbot-command): Add '-n' and '--agree-tos' options.
(certbot-service-type): Remove default-value.

services: certbot: Rename 'host' to 'domain'.

* doc/guix.texi (Certificate Services): Rename 'host' to 'domain'.
* gnu/services/certbot.scm (<certbot-configuration>, certbot-renewal-jobs,
certbot-activation, certbot-nginx-server-configurations,
certbot-service-type): Rename 'host' to 'domain'.

services: certbot: Run certbot twice a day at a random minute.

* doc/guix.texi (Certificate Services): Document it.
* gnu/services/certbot.scm (certbot-renewal-jobs): Change job's time
specification.

environment: Add --manifest option.

* guix/scripts/environment.scm (show-help, %options): Add -m/--manifest.
(options/resolve-packages): Handle manifests.
* tests/guix-envronment.sh: Add a test.
* doc/guix.texi (Invoking guix environment): Document it.

services: slim: Make the logged-in session show up in "w".

* gnu/services/xorg.scm (slim-shepherd-service): Use SESSREG to register X11
session.
* doc/guix.texi (slim-configuration): Document new field "sessreg".

Merge branch 'master' into core-updates

pack: Add '--manifest'.

* guix/scripts/pack.scm (%options, show-help): Add --manifest.
(guix-pack)[manifest-from-args]: New procedure.
Use it.
* doc/guix.texi (Invoking guix pack): Document --manifest.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

services: agetty: Add agetty instance to base services. Make its tty optional.

* gnu/services/base.scm (%base-services): Instantiate agetty-service.
(default-serial-port): New variable.
(agetty-shepherd-service): Make tty optional, default to the above.
* doc/guix.texi (agetty-configuration): Update "tty" documentation.
* gnu/system/install.scm (agetty-default-service): Delete variable.
(embedded-installation-os): Remove agetty-default-service instance.
Add "console" kernel-argument.

gnu: Add cat-avatar-generator-service.

* gnu/services/web.scm (cat-avatar-generator-service): New variable.
* doc/guix.text (Web Services): Document it.

Merge branch 'master' into core-updates

doc: Mention starting GNOME on Wayland manually.

* doc/guix.texi (Desktop Services): Mention starting GNOME on Wayland manually.

Merge branch 'master' into core-updates

gnu: services: Add wesnothd service.

* gnu/services/games.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.
* doc/guix.texi (Game Services): Document the service.

Merge branch 'master' into core-updates

etc: Add SELinux policy for the daemon.

* etc/guix-daemon.cil.in: New file.
* Makefile.am (dist_selinux_policy_DATA): Define it.
* configure.ac: Handle --with-selinux-policy-dir.
* doc/guix.texi (SELinux Support): New section.