gnu: linux-libre@4.9: Update to 4.9.69.

* gnu/packages/linux.scm (linux-libre-4.9): Update to 4.9.69.

gnu: linux-libre@4.1: Update to 4.1.48.

* gnu/packages/linux.scm (linux-libre-4.1): Update to 4.1.48.

gnu: hplip: Update to 3.7.11.

* gnu/packages/cups.scm (hplip): Update to 3.7.11.
[source]: Add 'snippet'.
[arguments]: In 'fix-hard-coded-file-names' phase, adjust hack for
$(hplip_statedir) creation.
[inputs]: Add ZLIB.
[native-inputs]: Add PERL.

gnu: guile-gdbm-ffi: Default to Guile 2.2.

* gnu/packages/guile.scm (guile-gdbm-ffi)[inputs]: Switch to GUILE-2.2.
(guile2.0-gdbm-ffi, guile2.2-gdbm-ffi): New variables.

etc: Add snippets.

* etc/snippets/scheme-mode/guix-cvs-reference,
etc/snippets/scheme-mode/guix-git-reference,
etc/snippets/scheme-mode/guix-hg-reference,
etc/snippets/scheme-mode/guix-origin,
etc/snippets/scheme-mode/guix-package,
etc/snippets/scheme-mode/guix-svn-reference,
etc/snippets/text-mode/guix-commit-message-add-package,
etc/snippets/text-mode/guix-commit-message-update-package: New files.
* doc/contributing.texi (The Perfect Setup): Document snippets.

gnu: texlive-bin: Disable tests on aarch64.

* gnu/packages/tex.scm (texlive-bin)[arguments]: Disable tests on aarch64.

gnu: ceres-solver: Update to 1.13.0.

* gnu/packages/maths.scm (ceres-solver): Update to 1.13.0.

gnu: eigen: Update to 3.3.4.

* gnu/packages/patches/eigen-arm-neon-fixes.patch: New patch.
* gnu/packages/algebra.scm (eigen): Update to 3.3.4.
[source]: Use patch.  Disable svd-preallocation test for BDCSVD.
[arguments]: Set "EIGEN_SEED" environment variable in check phase.
* gnu/local.mk (dist_patch_DATA): Add patch.

gnu: python-pyicu: Set python2-variant.

This follows up on commit d65854bdda4ad5464fcd8fe6289eedc13ea82ba1, which
did not fix test failures for dependents using package-with-python2.

* gnu/packages/python.scm (python-pyicu)[properties]: Set python2-variant.

gnu: r-foreach: Update to 1.4.4.

* gnu/packages/statistics.scm (r-foreach): Update to 1.4.4

gnu: text-editors: Fix nckx's copyright statement.

* gnu/packages/text-editors.scm: Fix Tobias Geerinckx-Rice's copyright
statement.

gnu: ghc-reflection: Update to 2.1.2.

* gnu/packages/haskell.scm (ghc-reflection): Update to 2.1.2.

gnu: Add lookingglass.

* gnu/packages/virtualization.scm (lookingglass): New variable.

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

system: Add BeagleBone Black installer.

* gnu/bootloader/u-boot.scm (u-boot-beaglebone-black-bootloader): New exported
  bootloader.
* gnu/system/install.scm (beaglebone-black-installation-os): New exported variable.

scripts: system: Add --expression option.

* guix/scripts/system.scm (show-help): Add expression option.
(%options): Ditto.
(guix-system): Allow commands taking a file as an argument to use an
expression instead.
(process-action): Read operating-system from expression or file.
* doc/guix.texi (Invoking guix system): Introduce the expression option.

gnu: python2-pyicu: Disable failing test.

* gnu/packages/python.scm (python2-pyicu)[arguments]: Add
‘delete-failing-test’ phase.

gnu: vis: Update to 0.4.

* gnu/packages/text-editors.scm (vis): Update to 0.4.
[arguments]: Document the #:tests situation and the (broken) #:test-target.
[inputs]: Add tre.

gnu: Add Easytag.

* gnu/packages/music.scm (easytag): New variable.

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

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.