gnu-maintenance: Get descriptions from 'gnumaint/pkgdescr.txt'.

* guix/gnu-maintenance.scm (%gnumaint-base-url): New variable.
  (%package-list-url): Use it.
  (%gsrc-package-list-url): Remove.
  (%package-description-url): New variable.
  (official-gnu-packages): Change to use %PACKAGE-DESCRIPTION-URL
  instead of %GSRC-PACKAGE-LIST-URL.  Adjust recutils field names
  accordingly.

Update 'TODO'.

gnu: Use the 'patches' field of <origin>.

* gnu/packages/apr.scm,
  gnu/packages/autotools.scm,
  gnu/packages/avahi.scm,
  gnu/packages/cdrom.scm,
  gnu/packages/cmake.scm,
  gnu/packages/cpio.scm,
  gnu/packages/cross-base.scm,
  gnu/packages/emacs.scm,
  gnu/packages/flex.scm,
  gnu/packages/fontutils.scm,
  gnu/packages/glib.scm,
  gnu/packages/grub.scm,
  gnu/packages/guile.scm,
  gnu/packages/idutils.scm,
  gnu/packages/libevent.scm,
  gnu/packages/linux.scm,
  gnu/packages/mail.scm,
  gnu/packages/make-bootstrap.scm,
  gnu/packages/mp3.scm,
  gnu/packages/oggvorbis.scm,
  gnu/packages/pdf.scm,
  gnu/packages/plotutils.scm,
  gnu/packages/qemu.scm,
  gnu/packages/recutils.scm,
  gnu/packages/rush.scm,
  gnu/packages/scheme.scm,
  gnu/packages/system.scm,
  gnu/packages/tcsh.scm,
  gnu/packages/valgrind.scm,
  gnu/packages/vpn.scm,
  gnu/packages/w3m: Use the 'patches' field of <origin> instead of
  adding a patch as input plus using #:patches.

packages: Add 'patches' and related fields to <origin>.

See <https://lists.gnu.org/archive/html/guix-devel/2013-09/msg00137.html>
for the rationale.

* guix/packages.scm (<origin>)[patches, patch-flags, patch-inputs,
  patch-guile]: New fields.
  (%standard-patch-inputs, default-guile, patch-and-repack): New
  procedures.
  (package-source-derivation): When 'patches' is non-empty, call
  'patch-and-repack'.
* guix/utils.scm (file-sans-extension): New procedure.

gnu: Add Qt 5.1.1.

* gnu/packages/qt.scm (qt): New variable.

gnu: Add Cairomm.

* gnu/packages/gtk.scm (cairomm): New variable.

Update 'AUTHORS'.

* AUTHORS: Add Alex, Joshua, and Aljosha.

Augment 'TODO'.

gnu: Add alsa-utils.

* gnu/packages/linux.scm (alsa-utils): New variable.

gnu: xmlto: Keep references to libxml2, libxslt, and util-linux programs.

* gnu/packages/xml.scm (xmlto): Add 'arguments' field.
  [inputs]: Add libxml2 and libxslt.

gnu: Gracefully handle circular dependencies between 'base' and 'linux'.

* gnu/packages/base.scm (linux-libre-headers-boot0): Turn into a thunk.
  User updated.

gnu: pari-gp: Update to 2.5.5.

* gnu/packages/algebra.scm (pari-gp): Update to 2.5.5.

gnu: mutt: Add input gpgme.

* gnu/packages/mail.scm (mutt): Add input gpgme.

gnu: Add gpgme.

* gnu/packages/gnupg.scm (gpgme): New variable.

gnu: icu4c: Patch RUNPATH of libraries.

* gnu/packages/icu4c.scm (icu4c): Elf-patch RUNPATH of libraries, for instance
    of libicuuc.so.

gnu: cdparanoia: Fix links of internal libraries into binary.

* gnu/packages/cdrom.scm (cdparanoia): Use patchelf to link internal libraries
    into binary.

gnu: Add libsigc++ and glibmm.

* gnu/packages/glib.scm (libsigc++, glibmm): New variable.

gnu: gobject-introspection: Export via #:export.

* gnu/packages/glib.scm: Export 'gobject-instrospection' via the
  #:export clause.

gnu: Add freeglut, glu, and FTGL.

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

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

gnu: ao: Build PulseAudio back-end.

* gnu/packages/oggvorbis.scm (ao): Add PulseAudio as an input.