vm: Call iso9660-image with #:register-closures? as #t.

* gnu/system/vm.scm (system-disk-image): Call iso9660-image with
  #:register-closures? as #t.

vm: Add support for registering closures to iso9660-image.

* gnu/system/vm.scm (iso9660-image): Add support for registering closures.

vm: Create /mnt in the generated ISO image in make-iso9660-image.

This is used in the installation process, as the mountpoint for the target
filesystem.

* gnu/build/vm.scm (make-iso9660-image): Create /mnt within the generated ISO
  image.

vm: Add support for registering closures to make-iso9660-image.

This mimics the functionality in the root-partition-initializer used in
creating the QEMU image. This helps when trying to run guix system init from
the generated ISO image.

* gnu/build/vm.scm (make-iso9660-image): Add support for registering closures.

gnu: file: Fix CVE-2017-1000249.

* gnu/packages/file.scm (file)[replacement]: New field.
(file/fixed): New variable.
* gnu/packages/commencement.scm (file-boot0): Use package/inherit.
* gnu/packages/patches/file-CVE-2017-1000249.patch.
* gnu/local.mk (dist_patch_DATA): Register it.

gnu: ruby-coderay: Update to 1.1.2.

* gnu/packages/ruby.scm (ruby-coderay): Update to 1.1.2.

gnu: nginx: Enable HTTP/2.0 (ngx_http_v2_module).

* gnu/packages/web.scm (nginx)[arguments]: Add ‘--with-http_v2_module’ flag.

services: web: Fix nginx-service-type's ‘file’ procedure.

* gnu/services/web.scm (nginx-activation, nginx-shepherd-service): Replace
references to non-existent ‘config-file’ with ‘file’.
* doc/guix.texi (Web Services): Likewise.

doc: Fix typo in copyright header.

* doc/guix.texi: Move stray ‘@*’ to where it belongs.

Handle the same HTTP redirects everywhere.

* guix/build/download.scm (http-fetch): Complete the hard-coded list of HTTP
redirection status codes.
* guix/http-client.scm (http-fetch): Likewise.
* guix/scripts/lint.scm (probe-uri): Likewise.

build: Negate ‘--disable-daemon’ help string.

This is a follow-up to commit c9b70836d080150046633edc782fdaaff9fc6d9c.

* configure.ac: Make ‘--disable-daemon’'s help text consistent with others.

gnu: tcpdump: Fix CVE-2017-[11541,11542,11543].

* gnu/packages/patches/tcpdump-CVE-2017-11541.patch,
gnu/packages/patches/tcpdump-CVE-2017-11542.patch
gnu/packages/patches/tcpdump-CVE-2017-11543.patch: New files.
* gnu/local.mk (dist_patch_DATA): Add them.
* gnu/packages/admin.scm (tcpdump)[source]: Use them.

gnu: libmediainfo: Adjust build phases.

* gnu/packages/video.scm (libmediainfo)[arguments]: Change to the build
directory before running autogen.

guix: Fix Guile current-processor-count deprecation warnings.

When current-processor-count is used without (ice-9 threads) being used, Guile
complains with the following warning:

Import (ice-9 threads) to have access to `current-processor-count'.

* guix/store.scm: Use (ice-9 threads).

gnu: elogind: Update to 232.3.

* gnu/packages/freedesktop.scm (elogind): Update to 232.3.
[home-page]: Use new upstream home page.
[arguments]: Disable tests, add new required configure flags; add build phase
"autogen".
[native-inputs]: Add autoconf, automake, libtool, and python.

gnu: r-tidyr: Update to 0.7.1.

* gnu/packages/statistics.scm (r-tidyr): Update to 0.7.1.

gnu: r-gdtools: Update to 0.1.6.

* gnu/packages/statistics.scm (r-gdtools): Update to 0.1.6.

gnu: Add r-sparql.

* gnu/packages/bioinformatics.scm (r-sparql): New variable.

gnu: epiphany: Update to 3.24.4.

* gnu/packages/gnome.scm (epiphany): Update to 3.24.4.

gnu: libvirt: Make selected inputs native-inputs.

* gnu/packages/virtualization.scm (libvirt)[inputs]: Move perl, polkit, and
python from here...
[native-inputs]: ...to here.