Merge branch 'python-build-system'.

gnu: python2-discogs-client: Remove python2-setuptools from inputs.

* gnu/packages/music.scm (python2-discogs-client): Use simply
  "package-with-python2". Remove inheriting from python-discogs-client
  since adding python2-setuptools to [native-inputs] has been the sole
  reason for inheriting.
  (python-discogs-client) Remove the now needless [properties]
  "python2-variant".

gnu: dovecot: Update to 2.2.26.0.

* gnu/packages/mail.scm (dovecot): Update to 2.2.26.0.
[arguments]: Patch shebangs in test file.

Merge branch 'master' into python-build-system

gnu: wicd: Fix build.

* gnu/packages/wicd.scm (wicd) [arguments]: Disable installation
  via setuptools (and --single-version-externally-managed).

gnu: wxPython: Remove useless inputs.

* gnu/packages/wxwidgets.scm (python2-wxpython) [native-inputs]: Remove
  setuptools, which is already included in python.

gnu: wxPython: Fix build.

* gnu/packages/wxwidgets.scm (python2-wxpython) [arguments]: Disable
  installation via setuptools (and --single-version-externally-managed).

gnu: oxygen-icons: Add 'upstream-name' property.

Fixes <http://bugs.gnu.org/25020>.
Reported by Hartmut Goebel <h.goebel@goebel-consult.de>.

* gnu/packages/kde-frameworks.scm (oxygen-icons)[properties]: New
field.

gnu-maintenance: 'latest-kde-release' honors 'upstream-name' properties.

* guix/gnu-maintenance.scm (latest-kde-release): Honor the
'upstream-name' property of PACKAGE.

refresh: Warn about packages that lack an updater.

* guix/upstream.scm (package-update-path): Rename to...
(package-latest-release): ... this.  Remove 'version>?' check.
(package-latest-release*): New procedure.
(package-update): Use it.
* guix/scripts/refresh.scm (lookup-updater): Rename to...
(lookup-updater-by-name): ... this.
(warn-no-updater): New procedure.
(update-package): Add #:warn? parameter and honor it.
(check-for-package-update): New procedure.
(guix-refresh)[warn?]: New variable.
Replace inline code when UPDATE? is false with a call to
'check-for-package-update'.
Pass WARN? to 'check-for-package-update' and 'update-package'.
* doc/guix.texi (Invoking guix refresh): Document it.  Fix a couple of
typos.

gnu: efl: Update to 1.18.3.

* gnu/packages/enlightenment.scm (efl): Update to 1.18.3.

gnu: wine: Use 'modify-phases' syntax.

* gnu/packages/wine.scm (wine)[arguments]: Use 'modify-phases' syntax.

gnu: wine: Update to 1.9.24.

* gnu/packages/wine.scm (wine): Update to 1.9.24.
[home-page]: Use https.

gnu: Add non-session-manager.

* gnu/packages/music.scm (non-session-manager): New variable.

gnu: offlineimap: Update to 7.0.10.

* gnu/packages/mail.scm (offlineimap): Update to 7.0.10.

gnu: cairo: Fix CVE-2016-9082.

* gnu/packages/gtk.scm (cairo)[replacement]: New field.
(cairo/fixed): New variable.
(cairo-xcb)[source]: Use patch.
[replacement]: New field, set false.
* gnu/packages/pdf.scm (poppler)[inputs]: Custom cairo should be
replaced by a new custom patched cairo.
* gnu/packages/patches/cairo-CVE-2016-9082.patch: New file.
* gnu/local.mk (dist_patch_DATA): Register it.

gnu: Add viewnior.

* gnu/packages/image-viewers.scm (viewnior): New file.
* gnu/local.mk (GNU_SYSTEM_MODULES): Add it.

gnu: Add wgetpaste.

* gnu/packages/wget.scm (wgetpaste): New variable.

gnu: aspell-dict-en: Update to 2016.11.20-0.

* gnu/packages/aspell.scm (aspell-dict-en): Update to 2016.11.20-0.

gnu: Allow nfs file systems to be automatically mounted.

* gnu/build/file-systems.scm (mount-file-system): Append target addr= when
mounting nfs filesystems.