doc: Suggest running guix-daemon with 'sudo -E'.

Suggested by Martin H. <maze@strahlungsfrei.de>.

* doc/contributing.texi (Running Guix Before It Is Installed): Suggest
'sudo -E'.

gnu: mlmmj: Update to 1.3.0.

* gnu/packages/mail.scm (mlmmj): Update to 1.3.0.

Signed-off-by: Leo Famulari <leo@famulari.name>

gnu: xpra: Update to 2.2.2.

* gnu/packages/xorg.scm (xpra): Update to 2.2.2.

gnu: sxiv: Update to 24.

* gnu/packages/image-viewers.scm (sxiv): Update to 24.
[inputs]: Add freetype and libxft.
[arguments]: Pass freetype header location in #:make-flags.  Be verbose.

docs: Fix typo in qemu-binfmt example.

* doc/guix.texi (Virtualization Services): Document 'guix-support?' properly.

gnu: services: web: Add service for httpd.

* gnu/services/web.scm (<httpd-module>,
  <httpd-config-file>, <httpd-virtualhost>
  <httpd-configuration>): New record types.
  (%default-httpd-modules, %httpd-accounts,
  httpd-service-type): New variables.
  (httpd-shepherd-services, httpd-activation,
  httpd-process-extensions): New procedures.
* gnu/tests/web.scm (run-httpd-test): New procedure.
  (%httpd-os, %tests-httpd): New variables.
* doc/guix.texi (Web Services): Document the Apache HTTP Server.

gnu: tests: web: Generalise the nginx test.

So that it can also be used for other web servers.

* gnu/tests/web.scm (%index.html-contents): Change nginx to guix.
  (%make-http-root): Move the index.html file from /srv to /srv/http.
  (%nginx-servers): Remove the setting of root.
  (run-nginx-test, run-webserver-test): Rename run-nginx-test to
  run-webserver-test and generalise its behaviour
  (%test-nginx): Change to use run-webserver-test, rather than run-nginx-test.

gnu: bullet: Update to 2.87.

* gnu/packages/game-development.scm (bullet): Update to 2.87.
[home-page]: Update to new home-page.

gnu: game-development.scm: Arrange module inputs alphabetically.

* gnu/packages/game-development.scm: Arrange module inputs
alphabetically.

gnu: foo2zjs: Update to 20171202.

* gnu/packages/cups.scm (foo2zjs): Update to 20171202.

gnu: foo2zjs: Use correct metadata

* gnu/packages/cups.scm (foo2zjs)[home-page, synopsis, description]: Describe
foo2zjs, not foo2xqx.
[licence]: Add expat.

gnu: foomatic-filters: Update to 4.0.17.

* gnu/packages/cups.scm (foomatic-filters): Update to 4.0.17.

gnu: sdl2-image: Update to 2.0.2.

* gnu/packages/sdl.scm (sdl2-image): Update to 2.0.2.

gnu: sdl2-mixer: Update to 2.0.2.

* gnu/packages/sdl.scm (sdl2-mixer): Update to 2.0.2.

gnu: Add python-shapely and python2-shapely.

* gnu/packages/python.scm (python-shapely, python2-shapely): New variables.

gnu: isc-dhcp: Update to 4.3.6.

* gnu/packages/admin.scm (isc-dhcp): Update to 4.3.6.

gnu: isc-dhcp: Update bundled bind to 9.9.11-P1 [fixes CVE-2017-3145].

* gnu/packages/admin.scm (isc-dhcp): Update to 9.9.11-P1.

gnu: bind: Update to 9.11.2-P1 [fixes CVE-2017-3145].

* gnu/packages/dns.scm (isc-bind): Update to 9.11.2-P1.

gnu: haskell-check: Use HTTPS for hspec.github.io home pages.

* gnu/packages/haskell-check.scm (hspec-discover, ghc-hspec-core)
(ghc-hspec-meta, ghc-hspec, ghc-hspec-contrib)[home-page]: Use HTTPS.

gnu: python: Use HTTPS for ipython.org home pages.

* gnu/packages/python.scm (python-ipython-genutils, python-traitlets)
(python-ipykernel, python-ipython, python-widgetsnbextension)
(python-ipywidgets)[home-page]: Use HTTPS.