scripts: system: Display bootloader name in "list-generations".

* guix/scripts/system.scm (display-system-generation): Display
  bootloader name.

scripts: system: Adapt "switch-generation" to new bootloader API.

* guix/scripts/system.scm (reinstall-grub): Rename to
  reinstall-bootloader. Read boot-device and boot-type from parameters file to
  be able to restore the correct bootloader on specified device.
  Factorize bootloader installation code by calling install-bootloader.
 (system-bootloader-name): New procedure.
 (switch-to-system-generation): Adapt.

scripts: system: Adapt "init" to new bootloader API.

* guix/scripts/system.scm (install): Pass installer a new
argument. Rename other arguments.
Call install-bootloader instead of install-grub*.
(perform-action): Adapt.

scripts: system: Adapt "reconfigure" to new bootloader API.

* guix/scripts/system.scm (install-grub*): Rename to install-bootloader.  Use
keys to pass arguments.  Pass a new argument, "installer-drv" which is a script
in store dealing with bootloader-specific install actions.  Also call
"install-boot-config" to install the bootloader config file.

(install-bootloader-derivation): New procedure.  It returns a derivation that
builds a file containing "install-procedure" gexp.

(perform-action): Build install-proc derivation and call install-bootloader
with the resulting file.  Stop adding GRUB to PATH as bootloaders are called in
install-proc with direct store paths.

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.

ui: Disable Guile deprecation warnings by default.

* guix/ui.scm (initialize-guix): Call (debug-disable 'warn-deprecated)
when "GUILE_WARN_DEPRECATED" is not set.

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.

hydra: Cross-build Guile 2.2.

* build-aux/hydra/gnu-system.scm (%core-packages): Add GUILE-2.2.

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.

doc: Mention 'sync' after 'dd'.

Suggested by librenoob on #guix.

* doc/guix.texi (USB Stick Installation): Add 'sync' invocation.

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

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

doc: Mention 'GUIX_PACKAGE_PATH' in "Defining Packages".

* doc/guix.texi (Defining Packages): Mention 'GUIX_PACKAGE_PATH'.

utils: 'compressed-file?' matches ".lzma" files.

* guix/utils.scm (compressed-file?): Add "lzma" to the list.

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.