bootloader: Add bootloader name to boot-parameters record.

* gnu/system.scm (<boot-parameters>)[name]: New field.
(boot-parameters-boot-name): Ditto.
(operating-system-boot-parameters-file): Add new field.
(operating-system-boot-parameters): Ditto.
(read-boot-parameters): Ditto.

bootloader: Adapt vm to new bootloader API.

* gnu/build/install.scm (install-boot-config): New procedure.
  (install-grub): Move to (gnu bootloader grub).
* gnu/build/vm.scm (register-bootcfg-root): Rename register-grub.cfg-root and
  adjust accordingly.
  (initialize-hard-disk): Takes a bootloader-package, bootcfg, bootcfg-location and
  bootloader-installer procedure. Adjust accordingly.
* gnu/system/vm.scm (qemu-image): Adjust to initialize-hard-disk.
  (system-disk-image, system-qemu-image, system-qemu-image/shared-store):
  Adjust to qemu-image.

bootloader: Add extlinux support.

* gnu/bootloader.scm: New file.
* gnu/bootloader/extlinux.scm: New file.
* gnu/bootloader/grub.scm: New file.
* gnu/local.mk: Build new files.
* gnu/system.scm: Adapt to new bootloader api.
* gnu/scripts/system.scm: Adapt to new bootloader api.
* gnu.scm: Remove (gnu system grub) and replace by (gnu bootloader) and (gnu
bootloader grub) modules.
* gnu/system/grub.scm: Moved content to gnu/bootloader/grub.scm.
* gnu/system/vm: Replace (gnu system grub) module by (gnu bootloader).
* gnu/tests.scm: Ditto.
* gnu/tests/nfs.scm: Ditto.

gnu: guile-ssh: Fix bug in 'node-guile-version'.

* gnu/packages/patches/guile-ssh-rexec-bug.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/ssh.scm (guile-ssh)[source](patches): New field.

gnu: khard: Update to 0.11.4.

* gnu/packages/mail.scm (khard): Update to 0.11.4.

gnu: bind: Rename variable to 'isc-bind'.

Reported by Leo Famulari.

* gnu/packages/dns.scm (bind): Rename to...
(isc-bind): ... this.
* gnu/packages/sssd.scm (sssd)[inputs]: Adjust accordingly.

services: guix: Authorize the key for bayfront.guixsd.org.

* gnu/services/base.scm (%default-authorized-guix-keys): Add
"bayfront.guixsd.org".

gnu: antlr2: Minor stylistic changes.

* gnu/packages/java.scm (antlr2)[source]: Fix indentation; end snippet on #t;
add comment next to disabled tests.

gnu: antlr2: Simplify build phases.

* gnu/packages/java.scm (antl2)[arguments]: Simplify build phases.

gnu: Add non-timeline.

* gnu/packages/music.scm (non-timeline): New variable.

gnu: Add non-mixer.

* gnu/packages/music.scm (non-mixer): New variable.

gnu: Add java-javax-mail.

* gnu/packages/java.scm (java-javax-mail): New variable.

gnu: Add java-log4j-api.

* gnu/packages/java.scm (java-log4j-api): New variable.

gnu: Add java-eclipse-jdt-core.

* gnu/packages/java.scm (java-eclipse-jdt-core): New variable.

gnu: Add java-eclipse-text.

* gnu/packages/java.scm (java-eclipse-text): New variable.

gnu: Add java-eclipse-core-commands.

* gnu/packages/java.scm (java-eclipse-core-commands): New variable.

gnu: Add java-eclipse-team-core.

* gnu/packages/java.scm (java-eclipse-team-core): New variable.

gnu: Add java-eclipse-compare-core.

* gnu/packages/java.scm (java-eclipse-compare-core): New variable.

gnu: Add java-icu4j.

* gnu/packages/icu4c.scm (java-icu4j): New variable.

gnu: Add java-eclipse-core-resources.

* gnu/packages/java.scm (java-eclipse-core-resources): New variable.