doc: Add 'cups-configuration' example with 'hplip'.

* doc/guix.texi (Printing Services): Add example with 'hplip'.

packages: Add 'package-upstream-name' and use it.

* guix/packages.scm (package-upstream-name): New procedure.
* guix/gnu-maintenance.scm (gnu-package?, ftp-server/directory)
(latest-release*, latest-gnome-release)
(latest-kde-release): Use it instead of the inline expression.

import: github: Better tolerate unexpected file extensions.

* guix/import/github.scm (find-extension): Add ".tbz".
(updated-github-url): When 'find-extension' returns #f, use "" for EXT.

gnu-maintenance: 'gnu-package?' ignores invalid URLs.

* guix/gnu-maintenance.scm (gnu-package?)[gnu-home-page?]: Add '>>'
threading macro and use it.

gnu: emacs-emms: Add 'upstream-name' property.

* gnu/packages/emacs.scm (emms)[properties]: New field.

gnu-maintenance: GNU updater handles gnu.org-hosted Emacs packages.

* guix/gnu-maintenance.scm (pure-gnu-package?): If an "emacs-" package
matches 'gnu-hosted?', return true.
(gnu-hosted?): New procedure.

gnu-maintenance: Honor 'upstream-name' property in GNU updater.

* guix/gnu-maintenance.scm (gnu-package?): Honor the 'usptream-name'
property of PACKAGE.
(ftp-server/directory): Likewise.

gnu: offlineimap: Update to 7.0.13.

* gnu/packages/mail.scm (offlineimap): Update to 7.0.13.

gnu: btrfs-progs: Update to 4.9.1.

* gnu/packages/linux.scm (btrfs-progs): Update to 4.9.1.

Update .mailmap entries for ng0.

* .mailmap: Update entries for ng0.

Signed-off-by: Tobias Geerinckx-Rice <me@tobias.gr>

gnu: extremetuxracer: Update to 0.7.4.

* gnu/packages/games.scm (extremetuxracer): Update to 0.7.4.

gnu: linux-libre: Update to 4.9.6.

* gnu/packages/linux.scm (%linux-libre-version, %linux-libre-hash)
(linux-libre): Update to 4.9.6.

gnu: linux-libre@4.4: Update to 4.4.45.

* gnu/packages/linux.scm (linux-libre-4.4): Update to 4.4.45.

gnu: pius: Update to 2.2.3.

* gnu/packages/gnupg.scm (pius): Update to 2.2.3.
[source]: Switch back to using the tarball release.
[arguments]: End 'set-gpg-file-name' phase on #t.

Signed-off-by: Marius Bakke <mbakke@fastmail.com>

gnu: kakoune: Move reproducibility substitution to source snippet.

* gnu/packages/text-editors.scm (kakoune)[arguments]: Move substitution to ...
[source]: ... here.

Signed-off-by: Marius Bakke <mbakke@fastmail.com>

gnu: openssl-next: Update to 1.1.0d [fixes CVE-2017-{3730, 3731, 3732}].

* gnu/packages/tls.scm (openssl-next): Update to 1.1.0d.

Signed-off-by: Marius Bakke <mbakke@fastmail.com>

gnu: openssl: Replace with openssl-1.0.2k [security fixes].

Fix CVE-2016-7055 and CVE-2017-{3731,3732}.

* gnu/packages/tls.scm (openssl)[replacement]: New field.
(openssl-1.0.2k): New variable.
(openssl-next)[replacement]: New field.

Signed-off-by: Marius Bakke <mbakke@fastmail.com>

gnu: text-editors.scm: Fix imports.

This is a followup to 5613ea79fccc5a5befafea313cb81010c5f5a8dd.

* gnu/packages/text-editors.scm: Import (gnu packages terminals).

gnu: Add kakoune.

* gnu/packages/text-editors.scm (kakoune): New variable.

Signed-off-by: Marius Bakke <mbakke@fastmail.com>

gnu: python-pbr: Update to 1.10.0.

* gnu/packages/python.scm (python-pbr): Update to 1.10.0.