* gnu/packages/acct.scm (acct): Update to 6.6.2.

* gnu/packages/polkit.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Register new file.

* gnu/packages/gnupg.scm (libassuan): Update to 2.1.3.

* gnu/packages/grub.scm (unifont): New variable.
  (grub)[arguments]: Copy and unzip Unifont in 'patch-stuff' phase.
  [native-inputs]: Add UNIFONT.

* gnu/system/vm.scm (system-qemu-image/shared-store-script): Add
  #:full-boot? parameter and honor it.
* guix/scripts/system.scm (system-derivation-for-action): Likewise.
  (perform-action): Likewise.
  (show-help): Document '--full-boot'.
  (%options): Add '--full-boot'.
  (guix-system): Add #:full-boot? argument in call to 'perform-action'.
* doc/guix.texi (Invoking guix system): Document it.

* doc/guix.texi (Package Management): Add a word about the two user
  interfaces.

* gnu/services/xorg.scm (xorg-start-command): Add missing argv[0] in
  'execl' call.

* gnu/packages/xorg.scm (xf86-video-intel): Drop input libdrm, add input
    mesa.

* guix/scripts/lint.scm (starts-with-abbreviation?): New procedure.
  (check-synopsis-style)[check-start-with-package-name]: Use it.
* tests/lint.scm ("synopsis: start with abbreviation"): New test.

* guix/scripts/lint.scm (check-synopsis-style)[check-start-article]:
  Change to (const #t) when PACKAGE matches 'gnu-package?'.

* guix/scripts/lint.scm (properly-starts-sentence?): Add (, ", and ' as
  valid beginnings.

* guix/scripts/lint.scm (package-name-regexp): New procedure.
  (check-synopsis-style)[check-start-with-package-name]: Use it instead
  of 'string-prefix-ci?'.
* tests/lint.scm ("synopsis: start with package name prefix"): New test.

* gnu/packages/check.scm (cppunit)[description]: Add missing space.

* tests/lint.scm ("description: may start with a digit"): Replace
  (not (string-contains exp str)) with (string-null? exp).
  ("description: may start with lower-case package name"): Likewise.
  ("description: end-of-sentence detection with abbreviations"):
  Likewise.
  ("synopsis: may start with a digit"): Likewise.
  ("synopsis: ends with 'etc.'"): Likewise.

* gnu/packages/glib.scm (libsigc++): Move pkg-config to
  'native-inputs'.
  (glibmm): Likewise.
* gnu/packages/mpd.scm (mpd): Likewise.
* gnu/packages/package-management.scm (guix-0.7): Likewise.
* gnu/packages/sdl.scm (sdl-net): Likewise.
  (sdl-ttf): Likewise.
* gnu/packages/xiph.scm (vorbis-tools): Likewise.

* emacs/guix-prettify.el: New file.
* emacs.am (ELFILES): Add it.
* doc/emacs.texi (Emacs Prettify): New node.
* doc/guix.texi (Features): Mention it.

* gnu/services/xorg.scm (xorg-start-command): Add #:resolutions
  parameter and 'screen-section' procedure.  Use it.
* doc/guix.texi (X Window): Adjust accordingly.

* gnu/services/xorg.scm (xorg-start-command): Add #:drivers parameter.
  Add 'device-section' procedure, and use it in 'xserver.conf'.
* doc/guix.texi (X Window): Document it.

* gnu/services/xorg.scm (xorg-start-command)[xserver.conf]: Add missing
  double-quote in AllowMouseOpenFail.

* gnu/packages/xorg.scm (xf86-video-modesetting): New variable.
* gnu/services/xorg.scm (xorg-start-command)[xserver.conf]: Add
  ModulePath line for XF86-VIDEO-MODESETTING, commented out.

* gnu/system/vm.scm (common-qemu-options): New procedure.
  (system-qemu-image/shared-store-script): Use it.

* gnu/system/vm.scm (input->name+output): Remove.  Its last user
  disappeared in commit b53833b2.

* tests/guix-lint.sh: Remove redundant and non-portable 'export'.

Fixes <http://bugs.gnu.org/18521>.

* gnu/packages/ots.scm (ots)[arguments]: Add #:phases.

Note: some of these changes undo bits of 35b9e423.

* gnu/packages/base.scm, gnu/packages/gperf.scm, gnu/packages/guile.scm,
  gnu/packages/libidn.scm, gnu/packages/miscfiles.scm,
  gnu/packages/telephony.scm: Adjust synopses and descriptions as
  suggested by 'make sync-descriptions'.

* gnu/system.scm (etc-directory)[bashrc]: Set 'INFOPATH'.

* gnu/packages/package-management.scm (guix-devel): Update to commit
  84934f40.

* guix/monads.scm (lift): Remove 'nargs' parameter.

* emacs.am (ELFILES): Add "emacs/guix-messages.el".

* guix/scripts/import/pypi.scm (guix-import-pypi): Use 'leave' to handle
  cases where ARGS has zero or two or more elements.

Fixes <http://bugs.gnu.org/18831>.
Reported by Ian Denhardt <ian@zenhack.net>.

* guix/import/pypi.scm (url-fetch, json-fetch, pypi-fetch): Augment
  docstring to mention #f on failure.
  (pypi->guix-package): Likewise, and actually return #f on failure.
* guix/scripts/import/pypi.scm (guix-import-pypi): Call 'leave' when
  'pypi->guix-package' returns #f.

* gnu/services/networking.scm (ntp-service): New procedure.
* doc/guix.texi (Networking Services): Document it.

* gnu/services/base.scm (user-processes-service): Increase the default
  value of 'grace-delay'.  This leaves more time for processes to clean
  up their PID files, /tmp/.X0-lock, etc.

* gnu/packages/ntp.scm (ntp)[inputs]: New field.

* gnu/system/vm.scm (virtualized-operating-system): Add 'swap-devices'
  field.

* gnu/packages/sdl.scm (sdl-image, sdl-mixer, sdl-net, sdl-ttf): Prepend
  "http://" to 'home-page'.

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

* gnu/packages/image.scm (freeimage): Drop support for "mips64el-linux".

* gnu/packages/kde.scm (phonon): Update to 4.8.2.

* gnu/packages/xorg.scm (xf86-video-ati): Update to 6.14.6 to circumvent
    build failures.