file-systems: Improve error handling in the iso9660 case - fixes boot problem.

* gnu/build/file-systems.scm (read-iso9660-superblock): Modify.

gnu: freeciv: Update to 2.5.7.

* gnu/packages/games.scm (freeciv): Update to 2.5.7.
[source]: Update uri list.

gnu: Remove old vtk module dependence in image-processing.scm.

* gnu/packages/image-processing.scm: Remove old vtk module dependence.

gnu: wine: Update to 2.9

* gnu/packages/wine.scm (wine): Update to 2.9

Signed-off-by: Leo Famulari <leo@famulari.name>

gnu: slop: Update to 6.3.41.

* gnu/packages/xdisorg.scm (slop): Update to 6.3.41.

licenses: Add CC-BY 4.0.

* guix/licenses.scm (cc-by4.0): New variable.

gnu: mcelog: Update to 152.

* gnu/packages/linux.scm (mcelog): Update to 152.

gnu: linux-libre@4.1: Update to 4.1.40.

* gnu/packages/linux.scm (linux-libre-4.1): Update to 4.1.40.

gnu: grub: Run tests sequentially.

Reported by Maxim Cournoyer <maxim.cournoyer@gmail.com>
at <http://bugs.gnu.org/26936>.

* gnu/packages/bootloaders.scm (grub)[arguments]: Add #:parallel-tests?.

gnu: sudo: Update to 1.8.20p2.

* gnu/packages/admin.scm (sudo): Update to 1.8.20p2.

gnu: re2: Update to 2017-06-01.

* gnu/packages/regex.scm (re2): Update to 2017-06-01.

.mailmap: Add another alias for ng0.

Signed-off-by: Marius Bakke <mbakke@fastmail.com>

gnu: neomutt: Update to 20170602.

* gnu/packages/mail.scm (neomutt): Update to 20170602.

Signed-off-by: Arun Isaac <arunisaac@systemreboot.net>

substitute: Do not display the installed size.

* guix/scripts/substitute.scm (process-substitution): Do not show the
installed size in the "Downloading" message.

ui: 'show-what-to-build' warns when we don't have enough disk space.

* guix/ui.scm (check-available-space): New procedure.
(show-what-to-build): Compute 'installed-size' and call
'check-available-space'.

syscalls: Provide 'free-disk-space'.

* guix/build/syscalls.scm (free-disk-space): New procedure.
* guix/scripts/gc.scm (guix-gc)[ensure-free-space]: Use it instead of
'statfs'.

ui: 'show-what-to-build' displays how much will be downloaded.

* guix/ui.scm (show-what-to-build)[download-size]
[display-download-size?]: New variables.
Add cases for when DISPLAY-DOWNLOAD-SIZE? is true.

derivations: 'derivation-prerequisites-to-build' returns <substitutable>.

* guix/derivations.scm (derivation-prerequisites-to-build): Rename
 #:substitutable? to #:substitutable-info.
[derivation-substitutable?]: Rename to...
[derivation-substitutable-info]: ... this.  Return a list of <substitutable>.
Second return value is now a list of <substitutable> instead of a list
of strings.
* guix/ui.scm (show-what-to-build)[substitutable?]: Rename to...
[substitutable-info]: ... this.
Adjust to new 'derivation-prerequisites-to-build' return value type.
* tests/derivations.scm ("derivation-prerequisites-to-build and
substitutes"): Adjust.
("derivation-prerequisites-to-build and substitutes, local build"):
Likewise.

derivations: 'substitution-oracle' returns a <substitutable>.

* guix/derivations.scm (substitution-oracle): Use
'substitution-path-info' instead of 'substitution-paths'.  Turn SUBST
into a vhash from path to <substitutable>.  Change the returned
procedure to provide a <substitutable> instead of a Boolean.
* tests/derivations.scm ("substitution-oracle and #:substitute? #f"):
Mock 'substitutable-path-info' instead of 'substitutable-paths'.

gnu: Move vtk to image-processing.scm.

* gnu/packages/image-processing.scm (vtk): New variable.
* gnu/packages/vtk.scm: Delete file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Remove it.

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