offload: Call 'machine-load' only once per machine.

This fixes a longstanding issue where 'choose-build-machine' would make
on average O(N log(N)) calls to 'machine-load', plus an extra call for
the selected machine, instead of N calls.

* guix/scripts/offload.scm (machine-load): Add comment.
(machine-power-factor, machine-less-loaded-or-faster?): Remove.
(choose-build-machine)[machines+slots]: Rename to...
[machines+slots+loads]: ... this.
[undecorate]: Adjust accordingly.
[machine-less-loaded-or-faster?]: New procedure.
Remove extra 'machine-load' call in body.

gnu: Add Mozilla Fira Mono font.

* gnu/packages/fonts.scm (font-fira-mono): New variable.

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

gnu: cyrus-sasl: Fix CVE-2013-4122.

* gnu/packages/patches/cyrus-sasl-CVE-2013-4122.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/cyrus-sasl.scm (cyrus-sasl)[replacement]: New field.
(cyrus-sasl/fixed): New variable.
[source]: Use patch.

gnu: ffmpeg: Update to 3.2.1.

* gnu/packages/video.scm (ffmpeg): Update to 3.2.1.

gnu: gst-plugins-good: Fix CVE-2016-{9634,9635,9636} and other security issues.

* gnu/packages/patches/gst-plugins-good-fix-crashes.patch,
gnu/packages/patches/gst-plugins-good-fix-invalid-read.patch,
gnu/packages/patches/gst-plugins-good-fix-signedness.patch,
gnu/packages/patches/gst-plugins-good-flic-bounds-check.patch: New files.
* gnu/local.mk (dist_patch_DATA): Add them.
* gnu/packages/gstreamer.scm (gst-plugins-good): Use them.

services: Factorize configuration abstraction.

* gnu/services/mail.scm and gnu/services/cups.scm (&configuration-error)
(configuration-error, configuration-field-error)
(configuration-missing-field, configuration-field, serialize-configuration)
(validate-configuration, define-configuration, uglify-field-name)
(serialize-field, serialize-package, serialize-string)
(serialize-space-separated-string-list, space-separated-string-list?)
(serialize-file-name, file-name?, serialize-field-name)
(generate-documentation): Move duplicate code...
* gnu/services/configuration.scm: ...to this new file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add configuration.scm.

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

gnu: psyclpc: Update comment.

This is a followup to commit eaa45301f46f13a3f71bcae6089d312f31174801.

* gnu/packages/messaging.scm (psyclpc): Update comment.

gnu: Move content of (gnu packages psyc) into (gnu packages messaging).

* gnu/packages/psyc.scm (perl-net-psyc, libpsyc, psyclpc): Move this ...
* gnu/packages/messaging.scm (perl-net-psyc, libpsyc, psyclpc): ... here.
* gnu/local.mk (GNU_SYSTEM_MODULES): Remove psyc.scm.

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

gnu: psyclpc: Upgrade to 20160821-2.61cf9aa.

This makes the package reproducible.

* gnu/packages/psyc.scm (psyclpc): Upgrade to 20160821-2.61cf9aa.

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

gnu: python-flask: Update to 0.11.1.

* gnu/packages/python.scm (python-flask): Update to 0.11.1.
[native-inputs]: Add python-click.

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

gnu: python-pyopenssl: Update to 16.2.0.

* gnu/packages/python.scm (python-pyopenssl): Update to 16.2.0.

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

gnu: python-simplejson: Update to 3.10.0.

* gnu/packages/python.scm (python-simplejson): Update to 3.10.0.

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

pull: Add guile-ssh to the dependencies.

Fix regression introduced in 9e76eed.

* build-aux/build-self.scm (guile-ssh): New variable.
(build)[builder]: Add 'guile-ssh' to %load-path and %load-compiled-path.

gnu: Add mumble.

* gnu/packages/telephony.scm (mumble): New variable.

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

gnu: transmission: Update to 2.92.

* gnu/packages/bittorrent.scm (transmission): Update to 2.92.
[inputs]: Add cyrus-sasl.

gnu: roary: Update to 3.7.0.

* gnu/packages/bioinformatics.scm (roary): Update to 3.7.0.

gnu: Add proteinortho.

* gnu/packages/bioinformatics.scm (proteinortho): New variable.

gnu: Add python-polib.

* gnu/packages/python.scm (python-polib, python2-polib): New variables.

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

gnu: Whitespace changes

* gnu/services/kerberos.scm: Fold lines to 80 character limit.

mailmap: Associate all commits by ng0 with ng0.

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