gnu: findnewest: Update to 0.3.

* gnu/packages/version-control.scm (findnewest): Update to 0.3.

emacs: Use '@' to separate package names and version numbers.

This is a followup to commit 1b846da8c372bee78851439fd9e72b2499115e5a.

* emacs/guix-base.el (guix-package-name-specification): Use "@" instead
of "-".
* emacs/guix-main.scm (name+version->full-name): Likewise.
(package-inputs-names): Use 'make-package-specification' instead of
'package-full-name'.
(full-name->name+version): Update the docstring.
* emacs/guix-ui-package.el (guix-packages-by-name): Likewise.

emacs: hydra: Use '-' to separate job names and version numbers.

* emacs/guix-hydra.el (guix-hydra-job-name-specification): New procedure.
* emacs/guix-ui-package.el (guix-package-info-insert-systems)
(guix-package-list-latest-builds): Use it.

gnu: exim: Update to 4.86.2 [fixes CVE-2016-1531].

* gnu/packages/mail.scm (exim): Update to 4.86.2.

gnu: Add byzanz.

* gnu/packages/gnome.scm (byzanz): New variable.

doc: Improve Info categories.

* doc/guix.texi: Change main category to "System administration".  Fix
syntax of subnodes.  Add entries for 'guix pull' and 'guix gc'.  Add
"Emacs" category.

build: Use (guix grafts) as needed.

This is a followup to 7adf9b8.

* build-aux/check-final-inputs-self-contained.scm: Use (guix grafts).
* build-aux/check-available-binaries.scm: Likewise.

gnu: youtube-dl: Update to 2016.03.01.

* gnu/packages/video.scm (youtube-dl): Update to 2016.03.01.

gnu: mpv: Update to 0.16.0.

* gnu/packages/video.scm (mpv): Update to 0.16.0.

gnu: perl: Replace with patched version [fixes CVE-2016-2381].

* gnu/packages/patches/perl-CVE-2016-2381.patch: New file.
* gnu-system.am (dist_patch_DATA): Add it.
* gnu/packages/perl.scm (perl)[replacement]: New field.
(perl-fixed): New variable.
* gnu/packages/commencement.scm (perl-boot0)[replacement]: New field.

gnu: irssi: Support proxy, socks, bot.

* gnu/packages/irc.scm (irssi)[arguments]: Add configure flags to
support proxy, socks and bot.

gnu: irssi: Update to 0.8.18.

* gnu/packages/irc.scm (irssi): Update to 0.8.18.
[source]: Update uri.

build: Build (guix import github) only when Guile-JSON is available.

Reported by Justus Winter <justus@gnupg.org>.

* Makefile.am (MODULES): Add guix/import/github.scm only when
HAVE_GUILE_JSON.

po: Drop removed file 'weechat.scm'.

Fixes <http://bugs.gnu.org/22888>.
weechat has been merged into 'irc.scm' in e288f007.

* po/packages/POTFILES.in: Drop removed file 'weechat.scm'.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

system: GRUB menu entry says "beta" instead of "alpha"

* gnu/system.scm (kernel->grub-label): Change "alpha" to "beta'.

Signed-off-by: Ludovic Courtès <ludo@gnu.org>

system: Add rfkill to '%base-packages'.

* gnu/system.scm (%base-packages): Add RFKILL.

gnu: python-pysam: Move cython and setuptools to native inputs.

* gnu/packages/bioinformatics.scm (python-pysam)[inputs]: Move
"python-cython" and "python-setuptools" from here...
[native-inputs]: ... to here.

gnu: deeptools: Update to 2.1.1.

* gnu/packages/bioinformatics.scm (deeptools): Update to 2.1.1.
[inputs]: Add "python2-numpydoc" and "python2-pybigwig".

gnu: deeptools: Change "propagated-inputs" to "inputs".

* gnu/packages/bioinformatics.scm (deeptools)[propagated-inputs]: Move
all inputs from here...
[inputs]: ...to here.

gnu: Add python-pybigwig.

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