gnu: chess: Update to 6.2.2.

* gnu/packages/games.scm (chess): Update to 6.2.2.

gnu: non-sequencer: Disable SSE when not building on x86_64.

* gnu/packages/music.scm (non-sequencer)[arguments]: Add "--disable-sse"
  flag when not building on x86_64.

gnu: fastcap: Remove non-free file.

* gnu/packages/engineering.scm (fastcap): Do it.

gnu: fastcap: Fix 'fix-doc phase.

* gnu/packages/engineering.scm (fastcap): Adapt documentation generation to
  change in TeXLive 2015.

emacs: devel: Highlight Guix keywords.

* emacs/guix-devel.el (guix-devel-keywords): New constant.
  (guix-devel-font-lock-keywords): Use it.

doc: emacs: Document "View graph" popup action.

* doc/emacs.texi (Emacs Popup Interface): Document "View graph" action.

emacs: Improve file names of generated graphs.

Suggested by Ludovic Courtès <ludo@gnu.org>.

* emacs/guix-external.el (guix-png-file-name): Change prefix of a file
  name to "guix-emacs-graph-" to avoid possible conflicts.

gnu-maintenance: Fix file descriptor leak.

* guix/gnu-maintenance.scm (official-gnu-packages): Close the port
  returned by FETCH.

gnu-maintenance: Use 'http-fetch/cached' by default.

This speeds up operations like 'guix lint -c gnu-description'.

* guix/gnu-maintenance.scm (official-gnu-packages): Add 'fetch'
  parameter and honor it.  Default to 'http-fetch/cached'.

http-client: Add 'http-fetch/cached'.

* guix/utils.scm (cache-directory): New procedure.
* guix/http-client.scm (%http-cache-ttl): New variable.
  (http-fetch/cached): New procedure.

install: Set the mtime in the binary tarball to 1.

Reported by anthk_ on #guix in Sept. 2015.

* gnu/system/install.scm (self-contained-tarball): Use --mtime=@1
  instead of --mtime=@0.

gnu: complexity: Update to 1.3.

* gnu/packages/code.scm (complexity): Update to 1.3.

file-systems: Do not truncate mount points that already exist.

Reported by David Thompson <dthompson2@worcester.edu>
at <https://lists.gnu.org/archive/html/guix-devel/2015-10/msg00284.html>.

* gnu/build/file-systems.scm (mount-file-system): When SOURCE matches
  'regular-file?', do not create MOUNT-POINT if it already exists.  This
  fixes a bug whereby we would be truncating MOUNT-POINT if it already
  existed.

syscalls: Fix ABI mismatch for 'clone'.

Fixes <http://bugs.gnu.org/21694>.

* guix/build/syscalls.scm (clone): Change 'syscall' parameter types to
  LONG, UNSIGNED-LONG, or '*; make sure it has 6 parameters.  Adjust
  caller accordingly.

gnu: mutt: Update to 1.5.24.

* gnu/packages/patches/mutt-CVE-2014-9116.patch: Delete file.
* gnu/packages/mail.scm (mutt): Update to 1.5.24.
  [source]: Update and remove patch.
* gnu-system.am (dist_patch_DATA): Unregister removed patch.

gnu: Add bspwm.

* gnu/packages/wm.scm (bspwm): New variable.

Signed-off-by: Alex Kost <alezost@gmail.com>

gnu: Add sxhkd.

* gnu/packages/xdisorg.scm (sxhkd): New variable.

Signed-off-by: Alex Kost <alezost@gmail.com>

emacs: Add "View graph" actions to system graph commands.

* emacs/guix-command.el (guix-command-additional-execute-arguments,
  guix-command-special-executors): Add "View graph" actions for
  'dmd-graph' and 'extension-graph' commands.

emacs: Disambiguate "d" key in 'system' popup.

* emacs/guix-command.el (guix-command-improve-system-argument): Use "D"
  key for 'disk-image' action (leave "d" for 'dmd-graph').

emacs: init: Add "share/emacs/site-lisp" to 'load-path'.

Fixes a regression introduced in 7741139080a6b00aa4f1846fe7668859e91bec58.

Reported by Ludovic Courtès <ludo@gnu.org>.

Not all emacs packages have "...-autoloads.el" files, so there is a
chance that "~/.guix-profile/share/emacs/site-lisp" will not be added to
'load-path', so add it unconditionally.

* emacs/guix-init.el: Add guix emacs directory to 'load-path'.  Move
  requiring 'guix-emacs' to the top-level.