linux-boot: Load modules and their dependencies, à la 'modprobe'.

* gnu/build/linux-boot.scm: Use (gnu build linux-modules).
  (load-linux-module*): Remove.
  (boot-system): Add #:linux-module-directory parameter.
  [lookup-module]: New procedure.
  Call 'current-module-debugging-port'.  Pass #:lookup-module to
  'load-linux-module*'.  Map LOOKUP-MODULE on LINUX-MODULES.
* gnu/system/linux-initrd.scm (base-initrd): Adjust 'boot-system' call
  accordingly.  Adjust #:modules argument as well.
* gnu/system.scm (operating-system-activation-script)[%modules]: Likewise.
* gnu/system/vm.scm (expression->derivation-in-linux-vm): Likewise.

linux-initrd: Copy modules and their dependencies to the initrd.

* gnu/system/linux-initrd.scm (flat-linux-module-directory)[build-exp]:
  Add 'lookup' procedure.  Use 'recursive-module-dependencies' to
  compute the list of modules to copy.
  Adjust #:modules parameter.

system: Add (gnu build linux-modules).

* gnu/build/linux-modules.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.

Add (guix elf).

* guix/elf.scm: New file.  Taken from Guile 'master', commit 3f826e3.
* Makefile.am (MODULES): Add it.
* THANKS: Thank Andy, who wrote this module.

doc: Update stale references in "Bootstrapping".

* doc/guix.texi (Bootstrapping): Final definitions are in (gnu packages
  commencement).
  Change gnu-build-system xref to "Build Systems".

substitute-binary: Change "unresponsive" to "slow".

* guix/scripts/substitute-binary.scm (fetch): Change "unresponsive" to
  "somewhat slow".  I'm being told that the former is often
  misunderstood as "broken".

gnu: gcl: Drop 'strip phase.

* gnu/packages/lisp.scm (gcl): Drop 'strip phase to make maxima build.

gnu: Add numpydoc.

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

system: Build system-wide locale definitions.

* gnu/system/locale.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.
* gnu/system.scm (<operating-system>)[locale]: Change the default to
  "en_US.utf8".
  (operating-system-locale-directory): New procecure.
  (operating-system-derivation): Use it.
* doc/guix.texi (Using the Configuration System): Change example locale
  to "fr_FR.utf8".
  (operating-system Reference): Add xref to "Locales".  Document
  'locale-definitions'.
  (Locales): New section.
* po/guix/POTFILES.in: Add gnu/system.scm.

gnu: ccrtp: Update to 2.1.1.

* gnu/packages/telephony.scm (ccrtp): Update to 2.1.1.

emacs: Add missing directory to the guile load path.

Reported by Adam Pribyl and David Thompson.

* emacs/guix-helper.scm.in (set-paths!): Add guile module dir to '%load-path'.

Update gnupg mirrors.

* guix/download.scm (%mirrors): Update mirror list for gnupg.

gnu: ucommon: Update to 6.2.2.

* gnu/packages/telephony.scm (ucommon): Update to 6.2.2.

gnu: sipwitch: Update to 1.9.3.

* gnu/packages/telephony.scm (sipwitch): Update to 1.9.3.

linux-boot: Call 'pre-mount' before 'mount-root-file-system'.

Partly fixes <http://bugs.gnu.org/19190>.
Reported by Nikita Karetnikov <nikita@karetnikov.org>.

* gnu/build/linux-boot.scm (boot-system): Move PRE-MOUNT call before
  'mount-root-file-system' is called.

linux-boot: Error out when 'pre-mount' returns #f.

* gnu/build/linux-boot.scm (boot-system): Call 'error' when PRE-MOUNT
  returns #f.

gnu: emms: Enable the 'mp3info' back-end for MP3 meta-data.

* gnu/packages/emacs.scm (emms)[arguments]: Properly initialize
  'emms-info-mp3info-program-name'.  This allows the 'emms-info-mp3info'
  back-end to be enabled by default, even when 'mp3info' is not in
  $PATH.

gnu: pkg-config: Add pkg.m4 to the cross pkg-config.

Suggested by John Darrington.

* gnu/packages/pkg-config.scm (cross-pkg-config): Make
  $out/share/aclocal a symlink to %PKG-CONFIG/share/aclocal.

emacs: Disable build traces produced by the daemon.

* emacs/guix-main.scm (process-package-actions,
  package-source-build-derivation): Pass #:print-build-trace #f to
  'set-build-options', to reduce verbosity.

gnu: gss: Update to 1.0.3.

* gnu/packages/gsasl.scm (gss): Update to 1.0.3.