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.

guix build: Add '--max-jobs' option.

Suggested by Deck Pickard <deck.r.pickard@gmail.com>.

* guix/scripts/build.scm (show-build-options-help): Document
  --max-jobs.
  (set-build-options-from-command-line): Pass #:max-build-jobs.
  (%standard-build-options): Add --max-jobs.
* doc/guix.texi (Invoking guix-daemon): Document the meaning of
  '--max-jobs 0'.
  (Invoking guix build): Document --max-jobs, with a reference to
  "Invoking guix-daemon'.

doc: Fix syntax errors.

* doc/guix.texi (Package Naming):
  (Fonts): Remove space between '@foo' and '{'.

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

gnu: Add pyparsing.

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

gnu: Remove #:select on circular dependency.

* gnu/packages/mp3.scm: Remove #:select on (gnu packages linux) so that
  the circular dependency is correctly handled.

gnu: Add EMMS.

* gnu/packages/emacs.scm (emms): New variable.

file-systems: 'file-system-needed-for-boot?' always returns #t for "/".

Reported by Nikita Karetnikov.

* gnu/system/file-systems.scm (<file-system>): Rename 'needed-for-boot?'
  accessor to '%file-system-needed-for-boot?'.
  (file-system-needed-for-boot?): New inlinable procedure.
* gnu/system.scm (other-file-system-services)[file-systems]: Rely on
  'file-system-needed-for-boot?' to handle the "/" case.
  (operating-system-initrd-file)[boot-file-systems]: Likewise.

gnu: libksba: Update to 1.3.2 [security fix].

* gnu/packages/gnupg.scm (libksba): Update to 1.3.2.

build: Bump version number.

* configure.ac: Bump to 0.9.

install: Add wpa-supplicant to the image.

Reported by Amirouche Boubekki <amirouche.boubekki@gmail.com>.

* gnu/system/install.scm (installation-os)[packages]: Add
  WPA-SUPPLICANT.

gnu: Add TagLib.

* gnu/packages/mp3.scm (taglib): New variable.

licenses: Add MPL 1.1.

* guix/licenses.scm (mpl1.1): New variable.

gnu: Add mp3info.

* gnu/packages/mp3.scm (mp3info): New variable.

import: gnu: Write the hash in nix-base32 format.

* guix/import/gnu.scm (gnu-package->sexp): Use
  'bytevector->nix-base32-string', not 'bytevector->base32-string'.