* guix/scripts/package.scm (show-help): Add help text for --install-from-file
  option.
  (%options): Add --install-from-file option.
* tests/guix-package.sh: Test it.
* doc/guix.texi ("invoking guix package"): Document it.
* doc/package-hello.scm: New file.
* doc.am (EXTRA_DIST): Add it.

This removes all I/O, which obviously makes things faster.

* guix/scripts/size.scm (file-size, store-item-exists?): Remove.
  (query-path-info*): New procedure.
  (file-size*): Rename to...
  (file-size): ... this; adjust caller.  Use 'query-path-info*' instead of
  'file-size'.

* guix/scripts/lint.scm (report-tabulations, report-trailing-white-space,
  report-long-line, report-formatting-issues, check-formatting): New
  procedures.
  (%formatting-reporters): New variable.
  (%checkers): Add 'formatting' checker.
* tests/lint.scm ("formatting: tabulation", "formatting: trailing white
  space", "formatting: long line", "formatting: alright"): New tests.
* doc/guix.texi (Invoking guix lint): Mention the 'formatting' checker.

* gnu/packages/patches/qemu-CVE-2015-5745.patch: New file.
* gnu/packages/patches/qemu-CVE-2015-3456.patch,
  gnu/packages/patches/qemu-CVE-2015-5154-pt1.patch,
  gnu/packages/patches/qemu-CVE-2015-5154-pt2.patch,
  gnu/packages/patches/qemu-CVE-2015-5154-pt3.patch,
  gnu/packages/patches/qemu-CVE-2015-5158.patch: Delete files.
* gnu-system.am (dist_patch_DATA): Add new file and remove the deleted ones.
* gnu/packages/qemu.scm (qemu): Update to 2.3.1.  Add new patch and remove the
  deleted ones.

This reverts commit ba139bd7.

This reverts commit e3484421.

This reverts commit e640340b.

This reverts commit 86e3f95a.

This reverts commit fb1e06fc.

This reverts commit fe1f2c80.

This reverts commit 9243fdf7.

This reverts commit 0f402e4c.

* gnu/packages/patches/network-manager-platform-managed.patch,
  gnu/packages/network-manager.scm: New files.
* gnu-system.am (GNU_SYSTEM_MODULES): Add network-manager.scm.
  (dist_patch_DATA): Add network-manager-platform-managed.patch.

TODO: Fix 'license' field.

* gnu/packages/networking.scm (ppp): New variable.

* gnu/packages/linux.scm (linux-libre): Update to 4.1.6.

* gnu/packages/tcl.scm (tk)[inputs]: Add LIBXFT.
  [native-inputs]: New field.

* gnu/packages/enlightenment.scm: Add Rage.

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

Co-Authored-By: Pjotr Prins <pjotr.public01@thebird.nl>

* guix/build-system/ruby.scm (lower): Remove git dependency.
  (rubygems-uri): New procedure.
* guix/build/ruby-build-system (gitify): Delete.
  (unpack): Use 'gem unpack' utility.
  (check): Add docstring.
  (build): Repack modified gem.
  (install): Rebuild unpacked gem and install it.
  (%standard-phases): Remove gitify and build phases.
* gnu/packages/ruby.scm (ruby-hoe, ruby-rake-compiler, ruby-i18n,
  ruby-rspec-support, ruby-rspec-core, ruby-diff-lcs-for-rspec,
  ruby-rspec-expectations, ruby-rspec-mocks, ruby-rspec, bundler,
  ruby-useragent, ruby-bacon, ruby-arel, ruby-connection-pool,
  ruby-net-http-persistent, ruby-minitest, ruby-minitest-sprint,
  ruby-minitest-bacon, ruby-daemons, ruby-git, ruby-slop,
  ruby-multipart-post): Convert to new build system.
* doc/guix.texi (ruby-build-system): Document the gem archive requirement.

* gnu/packages/ebook.scm (calibre): Update to 2.35.0.

On systems with a glibc prior to 2.14, the 'setns' function is not available.

Thanks to Eric Bavier for reporting the issue.

* guix/build/syscalls.scm (setns): Wrap with 'false-if-exception'.

* gnu/packages/statistics.scm (r)[native-search-paths]: Add
  specification for "R_LIBS_SITE" variable.

* gnu/packages/statistics.scm (r): Update to 3.2.2.

* gnu/packages/debug.scm (american-fuzzy-lop): New variable.

* gnu/packages/qemu.scm (qemu-headless)[arguments]: Honor #:configure-flags
  arguments for configure phase.

* gnu/packages/audio.scm (ardour): Update to 4.2.

* gnu/packages/mail.scm (notmuch): Update to 0.20.2.  Add python-sphinx native
  input.  Rewrite phases using 'modify-phases' syntax.

* gnu/packages/mail.scm (offlineimap): Update to 6.5.7.

* gnu/packages/audio.scm (guitarix): Update to 0.33.0.
  [native-inputs]: Add faust.

* gnu/packages/messaging.scm (znc): New variable.

* gnu/packages/video.scm (mplayer2): Removed variable.

* gnu/packages/gnome.scm (epiphany)[propagated-inputs]: New field.

* gnu/packages/algebra.scm (flint)[arguments]: Disable parallel tests,
  which makes the build pass on arm.

* gnu/packages/games.scm (gamine): New variable.

This is an improvement over commit af6100f5.

* gnu/packages/gnome.scm (glib-networking)[source](patches): New field.
  [arguments]: Pass '/etc/ssl/certs/ca-certificates.crt' to configure.
  Set 'SSL_CERT_FILE' to '/dev/null' in 'use-empty-ssl-cert-file' phase.
  (libsoup)[arguments]: Set 'SSL_CERT_FILE' to '/dev/null' in
  'pre-check' phase.
* gnu/packages/patches/glib-networking-ssl-cert-file.patch: New patch.
* gnu-system.am (dist_patch_DATA): Add it.