gnu: Add python-configparser.

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

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

gnu: Add python2-backports-functools-lru-cache.

* gnu/packages/python.scm (python2-backports-functools-lru-cache): New variable.

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

gnu: Add python-isort.

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

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

gnu: Add python-astroid.

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

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

gnu: Add libircclient.

* gnu/packages/messaging.scm (libircclient): New variable.

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

gnu: Add pdfgrep.

* guix/gnu/packages/pdf.scm (pdfgrep): New variable.

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

gnu: linux-libre: Update to 4.10.4.

* gnu/packages/linux.scm (%linux-libre-version): Update to 4.10.4.
(%linux-libre-hash): Update hash.

gnu: linux-libre@4.9: Update to 4.9.16.

* gnu/packages/linux.scm (linux-libre-4.9): Update to 4.9.16.

gnu: linux-libre@4.4: Update to 4.4.55.

* gnu/packages/linux.scm (linux-libre-4.4): Update to 4.4.55.

gnu: u-boot: Update to 2017.03.

* gnu/packages/bootloaders.scm (u-boot): Update to 2017.03.

gnu: icecat: Add selected fixes from upstream mozilla-esr45.

* gnu/packages/gnuzilla.scm (icecat)[source][patches]: Add selected fixes from
the upstream mozilla-esr45 repository.

gnu: libevent@2.0: Add fix from upstream.

This fix was cherry-picked by Mozilla from upstream libevent-2.1 to its
bundled copy of libevent-2.0.21 in mozilla-esr45.

* gnu/packages/patches/libevent-2.0-evbuffer-add-use-last-with-datap.patch:
New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/libevent.scm (libevent-2.0)[source][patches]: Add it.

gnu: guile-commonmark: Default to Guile 2.2.

* gnu/packages/guile.scm (guile-commonmark)[inputs]: Replace GUILE-2.0
with GUILE-2.2.
(guile2.0-commonmark): New variable.
(guile2.2-commonmark): Mark as deprecated.
(haunt)[propagated-inputs]: Use GUILE-COMMONMARK.

gnu: guile-reader: Default to Guile 2.2.

* gnu/packages/guile.scm (guile-reader)[inputs]: Change GUILE-2.0 to
GUILE-2.2.
(guile2.0-reader): New variable.
(guile2.2-reader): Mark as deprecated.
(haunt)[propagated-inputs]: Use GUILE-READER instead of
GUILE2.2-READER.

gnu: haunt: Default to Guile 2.2.

* gnu/packages/guile.scm (haunt)[inputs]: Replace GUILE-2.0 with
GUILE-2.2.
[propagated-inputs]: Replace GUILE-READER and GUILE-COMMONMARK with
their 2.2 variant.
(guile2.0-haunt): New variable.
(guile2.2-haunt): Mark as deprecated.

gnu: Add 'package-for-guile-2.0'.

* gnu/packages/guile.scm (guile-2.2-package-name): Rename to...
(guile-variant-package-name): ... this.  Change to return a lambda.
(package-for-guile-2.2): Adjust accordingly.
(package-for-guile-2.0): New procedure.

gnu: Rename "guile-next" to "guile".

* gnu/packages/guile.scm (guile-next): Rename to...
(guile-2.2): ... this.  Update users.
[name]: Change to "guile".
[synopsis]: Remove.
[properties]: Remove 'upstream-name', 'ftp-server', and
'ftp-directory'.
* gnu/packages/bioinformatics.scm (rcas-web): Update accordingly.
* gnu/packages/tls.scm (gnutls/guile-2.2): Likewise.
* tests/guix-build.sh: Use 'guile@2.2' instead of 'guile-next'.
* doc/guix.texi (Package Transformation Options): Update examples that
referred to "guile-next".

gnu: Add GNU Mach.

* gnu/packages/hurd.scm (gnumach): New variable.

Co-authored-by: Rene Saavedra <rennes@openmailbox.org>
Co-authored-by: Ludovic Courtès <ludo@gnu.org>

gnu: niftilib: Simplify build phases.

* gnu/packages/image.scm (niftilib)[arguments]: Use make-flags instead of
replacing "configure" phase; simplify "install" phase.

gnu: apl: Update to 1.7.

* gnu/packages/apl.scm (apl): Update to 1.7.
[home-page]: Use https.