build-system/perl: Lazily resolve (gnu packages perl).

* guix/build-system/perl.scm (default-perl): New procedure.
  (perl-build): Use it.

pull: Add '--url' option.

* guix/scripts/pull.scm (%default-options): Add 'tarball-url' pair.
  (%options, show-help): Add '--url'.
  (guix-pull): Honor it.

download: Support 'file://' URLs.

* guix/download.scm (download-to-store): When URL has a 'file' scheme or
  no scheme, use 'add-to-store' directly.

guix: Add missing call to 'bindtextdomain'.

* scripts/guix.in (config-lookup): Add "localedir" entry.
  (run-guix-main): Add call to 'bindtextdomain'.
* guix/ui.scm (initialize-guix): Use %GETTEXT-DOMAIN instead of a
  literal.

gnu: Add gp2c.

* gnu/packages/algebra.scm (gp2c): New variable.

gnu: Add Qt 4.8.5.

* gnu/packages/qt.scm (qt-4): New variable.
* gnu/packages/patches/qt4-tests.patch: New file, patch dropping tests
    requiring a running X server.

gnu: Add Mercurial.

* gnu/packages/version-control.scm (mercurial): New variable.

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

gnu-maintenance: Adjust URL of package description file.

* guix/gnu-maintenance.scm (%package-description-url): Adjust to the
  new URL.

gnu: Add GNU acct.

* gnu/packages/acct.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.

gnu: Valgrind: make it work with glibc 2.18.

* gnu/packages/patches/valgrind-glibc.patch: update it.

gnu: linux-libre-headers: Support cross-compilation.

* gnu/packages/linux.scm (linux-libre-headers):
  When (%current-target-system) is true, pass it as the argument to
  'build-phase'.  This fixes cross-compilation.
  Reported by Mark H. Weaver <mhw@netris.org>.

daemon: Set the umask to 022 when starting.

* nix/nix-daemon/guix-daemon.cc (main): Add 'umask' call.
* test-env.in: Remove use of 'umask'.

gnu: Add pavucontrol.

* gnu/packages/pulseaudio.scm (pavucontrol): New variable.

gnu: qt: Propagate input mesa.

* gnu/packages/qt.scm (qt): Propagate input mesa.

gnu: qt: Do not use special SSE etc. instructions.

* gnu/packages/qt.scm (qt): Add configure flags to disable machine specific
    instructions.

gnu: qt: Add input pulseaudio.

* gnu/packages/qt.scm (qt): Add input pulseaudio.

gnu: Add Pangomm, ATKmm, and GTKmm.

* gnu/packages/gtk.scm (atk)[synopsis]: Fix typo.
  (pangomm, atkmm, gtkmm): New variables.

list-packages: Show a list of patches for each package.

* build-aux/list-packages.scm (list-join): New procedure.
  (package->sxml)[patch-url]: New procedure.
  Use it.

snix: Prefer descriptions from the Womb rather than from Nixpkgs.

* guix/snix.scm (snix-derivation->guix-package): Use
  'gnu-package-doc-description' as the description for GNU packages.

Synchronize package descriptions with the Womb.

* gnu/packages/algebra.scm,
  gnu/packages/aspell.scm,
  gnu/packages/autotools.scm,
  gnu/packages/base.scm,
  gnu/packages/bash.scm,
  gnu/packages/bison.scm,
  gnu/packages/cdrom.scm,
  gnu/packages/cflow.scm,
  gnu/packages/compression.scm,
  gnu/packages/cpio.scm,
  gnu/packages/cppi.scm,
  gnu/packages/ddrescue.scm,
  gnu/packages/dejagnu.scm,
  gnu/packages/ed.scm,
  gnu/packages/emacs.scm,
  gnu/packages/fdisk.scm,
  gnu/packages/freeipmi.scm,
  gnu/packages/gawk.scm,
  gnu/packages/gcal.scm,
  gnu/packages/gcc.scm,
  gnu/packages/gdb.scm,
  gnu/packages/gdbm.scm,
  gnu/packages/gettext.scm,
  gnu/packages/ghostscript.scm,
  gnu/packages/global.scm,
  gnu/packages/gnunet.scm,
  gnu/packages/gnupg.scm,
  gnu/packages/gnutls.scm,
  gnu/packages/gperf.scm,
  gnu/packages/gprolog.scm,
  gnu/packages/groff.scm,
  gnu/packages/grub.scm,
  gnu/packages/gsasl.scm,
  gnu/packages/guile.scm,
  gnu/packages/gv.scm,
  gnu/packages/help2man.scm,
  gnu/packages/idutils.scm,
  gnu/packages/indent.scm,
  gnu/packages/less.scm,
  gnu/packages/libidn.scm,
  gnu/packages/libsigsegv.scm,
  gnu/packages/libunistring.scm,
  gnu/packages/lightning.scm,
  gnu/packages/linux.scm,
  gnu/packages/lsh.scm,
  gnu/packages/m4.scm,
  gnu/packages/mail.scm,
  gnu/packages/maths.scm,
  gnu/packages/multiprecision.scm,
  gnu/packages/nano.scm,
  gnu/packages/ncurses.scm,
  gnu/packages/nettle.scm,
  gnu/packages/ocrad.scm,
  gnu/packages/oggvorbis.scm,
  gnu/packages/parted.scm,
  gnu/packages/plotutils.scm,
  gnu/packages/pth.scm,
  gnu/packages/readline.scm,
  gnu/packages/recutils.scm,
  gnu/packages/rush.scm,
  gnu/packages/scheme.scm,
  gnu/packages/screen.scm,
  gnu/packages/shishi.scm,
  gnu/packages/smalltalk.scm,
  gnu/packages/system.scm,
  gnu/packages/texinfo.scm,
  gnu/packages/time.scm,
  gnu/packages/unrtf.scm,
  gnu/packages/version-control.scm,
  gnu/packages/wdiff.scm,
  gnu/packages/wget.scm,
  gnu/packages/which.scm,
  gnu/packages/xnee.scm,
  gnu/packages/zile.scm: Change value of the 'description' field to that
  of the Womb.