progress: Rename 'erase-in-line' to 'erase-current-line'.

Suggested by Danny Milosavljevic <dannym@scratchpost.org>.

* guix/progress.scm (erase-in-line): Rename to...
(erase-current-line): ... this.  Adjust callers.

bootloader: Factorize write-file-on-device.

* gnu/bootloader/extlinux.scm (install-extlinux): Factorize bootloader
writing in a new procedure write-file-on-device defined in (gnu build
bootloader).
* gnu/build/bootloader.scm: New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add new file.
* gnu/system/vm.scm (qemu-img): Adapt to import and use (gnu build bootloader)
module during derivation building.
* gnu/scripts/system.scm (bootloader-installer-derivation): Ditto.

vm: Adapt qemu command to ARM.

* gnu/build/vm.scm (load-in-linux-vm): New argument #:target-arm32.
Use it to adapt command for qemu-system-arm.  This implies to choose a
machine ("virt"), use the correct console port "ttyAMA0", disable KVM use
that is buggy on some ARM boards (Odroid XU4 for example) and use user mode
network stack instead of NIC. Gather all those options in a new variable
"arch-specific-flags".
* gnu/system/vm.scm (expression->derivation-in-linux-vm): Pass
to load-in-linux-vm "#:target-arm32?" argument.

doc: Fix typo.

* doc/guix.texi (DNS Services): Fix knot-configuration.

gnu: ruby: Replace with ruby-2.4.3 [fixes CVE-2017-17405].

* gnu/packages/ruby.scm (ruby-2.4.3): New variable.
(ruby)[replacement]: New field.

gnu: bedtools: Update to 2.27.1.

* gnu/packages/ruby.scm (bedtools): Update to 2.27.1.

gnu: ruby-2.2: Update to 2.2.9 [fixes CVE-2017-17405].

* gnu/packages/ruby.scm (ruby-2.2): Update to 2.2.9.

gnu: ruby-2.3: Update to 2.3.6 [fixes CVE-2017-17405].

* gnu/packages/ruby.scm (ruby-2.3): Update to 2.3.6.

gnu: yoshimi: Update to 1.5.5.

* gnu/packages/music.scm (yoshimi): Update to 1.5.5.

guix: ant-build-system: Do not compress jars.

Fixes <https://bugs.gnu.org/29700>.

* guix/build/ant-build-system.scm (strip-jar-timestamps): Do not compress jar
when repacking.

gnu: s-shell: Update to commit da2e5c20c0c5f477ec3426dc2584889a789b1659.

* gnu/packages/shells.scm (s-shell): Update to commit da2e5c20c0c5f477ec3426dc2584889a789b1659.
[version]: Use 'git-version'.

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

gnu: xpra: Update to 2.2.

* gnu/packages/xorg.scm (xpra): Update to 2.2.
[inputs]: Add python2-netifaces and python2-pyopengl-accelerate.  Fix
position of commas.

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

gnu: Add python2-pyopengl-accelerate.

* gnu/packages/python.scm (python2-pyopengl-accelerate): New variable.

Co-authored-by: Ludovic Courtès <ludo@gnu.org>

gnu: python-scikit-learn: Patch test non-determinism.

* gnu/packages/patches/python-scikit-learn-fix-test-non-determinism.patch:
New file.
* gnu/packages/machine-learning.scm (python-scikit-learn)[source]: Use it.
* gnu/local.mk (dist_patch_DATA): Add it.

gnu: diamond: Update to 0.9.14.

* gnu/packages/bioinformatics.scm (diamond): Update to 0.9.14.

gnu: gucharmap: Use glib-or-gtk-build-system.

* gnu/packages/gnome.scm (gucharmap): Use glib-or-gtk-build-system.

gnu: Erlang: Update to 20.1.7 [fixes CVE-2017-1000385].

* gnu/packages/erlang.scm (erlang): Update to 20.1.7
(native-inputs): Use version-major+minor in the URI of erlang-manpages.

gnu: youtube-dl: Update to 2017.12.14.

* gnu/packages/video.scm (youtube-dl): Update to 2017.12.14.

gnu: r-caret: Update to 6.0-78.

* gnu/packages/statistics.scm (r-caret): Update to 6.0-78

gnu: r-domc: Update to 1.3.5.

* gnu/packages/statistics.scm (r-domc): Update to 1.3.5