gnu: Add emacs-slime.

* gnu/packages/emacs.scm (emacs-slime): New variable.

gnu: mit-scheme: Generate and install documentation.

* gnu/packages/scheme.scm (mit-scheme): Add 'doc' output.
  [arguments]: Add phases 'configure-doc, 'build-doc and 'install-doc.
  [native-inputs]: Add 'texlive'. Move 'texinfo' and 'm4' from inputs.

gnu: mit-scheme: Convert to the 'modify-phases' syntax.

* gnu/packages/scheme.scm (mit-scheme): Do it.

gnu: Add emacs-constants.

* gnu/packages/emacs.scm (emacs-constants): New variable.
* gnu/packages/patches/emacs-constants-lisp-like.patch: New patch.
* gnu-system.am (dist_patch_DATA): Add it.

gnu: Add emacs-mit-scheme-doc.

* gnu/packages/emacs.scm (emacs-mit-scheme-doc): New variable.

gnu: scmutils: Generate 'scmutils-autoloads.el' file.

* gnu/packages/scheme.scm (scmutils): Do it.

gnu: Add emacs-scheme-complete.

* gnu/packages/emacs.scm (emacs-scheme-complete): New variable.
* gnu/packages/patches/emacs-scheme-complete-scheme-r5rs-info.patch: New patch.
* gnu-system.am (dist_patch_DATA): Add the new patch.

gnu: qemu: Update to 2.5.0; add fixes for security flaws.

* gnu/packages/patches/qemu-CVE-2015-6855.patch: Delete file.
* gnu/packages/patches/qemu-virtio-9p-use-accessor-to-get-thread-pool.patch,
  gnu/packages/patches/qemu-CVE-2015-8558.patch,
  gnu/packages/patches/qemu-CVE-2015-8567.patch,
  gnu/packages/patches/qemu-CVE-2015-8613.patch,
  gnu/packages/patches/qemu-CVE-2015-8701.patch,
  gnu/packages/patches/qemu-CVE-2015-8743.patch,
  gnu/packages/patches/qemu-CVE-2016-1568.patch,
  gnu/packages/patches/qemu-CVE-2016-1922.patch: New files.
* gnu-system.am (dist_patch_DATA): Remove 'qemu-CVE-2015-6855.patch'; add the
  new patches.
* gnu/packages/qemu.scm (qemu): Update to 2.5.0.
  [source]: Remove old patches and add new ones.
  [arguments]: Add 'disable-test-qga' phase.
  (%glib-memory-vtable-patch, %glib-duplicate-test-patch): Remove variables.

gnu: openssl: When computing URI, use 'string-trim-right' not 'string-take'.

* gnu/packages/tls.scm (openssl)[source]: When computing URI, use
  'string-trim-right' instead of 'string-take'.

gnu: yelp: Update to 3.18.1.

* gnu/packages/gnome.scm (yelp): Update to 3.18.1.

gnu: webkitgtk: Update to 2.10.7.

* gnu/packages/webkit.scm (webkitgtk): Update to 2.10.7.

gnu: openssl: Add alternate url.

* gnu/packages/tls.scm (openssl)[source]: Add alternate url.

gnu: eudev: Add variant that depends on libblkid.

This fixes a bug whereby /dev/disk/by-{label,id} would be missing on
GuixSD (/dev/disk/by-id would still contain device-mapped partitions
though.)

Reported by Mark H Weaver <mhw@netris.org>.

* gnu/packages/linux.scm (eudev-with-blkid): New variable.
* gnu/services/base.scm (udev-service): #:udev defaults to
EUDEV-WITH-BLKID.
* gnu/system.scm (%base-packages): Replace EUDEV with EUDEV-WITH-BLKID.

gnu: aspell: Wrap binary to find dictionaries.

* gnu/packages/aspell.scm (aspell): Add 'wrap-aspell' phase.
* gnu/system.scm (operating-system-etc-service): Remove 'ASPELL_CONF'
definition.

Co-authored-by: Ludovic Courtès <ludo@gnu.org>

gnu: vdirsyncer: Update to 0.8.1.

* gnu/packages/dav.scm (vdirsyncer): Update to 0.8.1.
[native-inputs]: Add python-hypothesis, python-pytest-subtesthack.

gnu: Add python-pytest-subtesthack.

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

licenses: Add the Unlicense.

* guix/licenses.scm (unlicense): New variable.

gnu: Add python-hypothesis.

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

gnu: Add awscli.

* gnu/packages/python.scm (awscli): New variable.

gnu: Add python-botocore.

* gnu/packages/python.scm (python-botocore): New variable.