gnu: rcs: Update to 5.9.4.

* gnu/packages/version-control.scm (rcs): Update to 5.9.4.

gnu: parallel: Update to 20150122.

* gnu/packages/parallel.scm (parallel): Update to 20150122.

gnu: libassuan: Update to 2.2.0.

* gnu/packages/gnupg.scm (libassuan): Update to 2.2.0.

gnu: util-linux: Do not build 'kill'.

* gnu/packages/linux.scm (util-linux)[source](snippet): Set
  "build_kill=no" in 'configure'.

gnu: e2fsprogs: Don't build libraries and commands provided by util-linux.

* gnu/packages/linux.scm (e2fsprogs)[arguments]: Add --disable-blkid
  --disable-libuuid --disable-uuidd --disable-fsck.

gnu: util-linux: Update to 2.25.2.

* gnu/packages/linux.scm (util-linux): Update to 2.25.2.  Remove
  util-linux-perl.patch, and add util-linux-tests.patch.  Adjust
  'snippet'.
  [arguments]: Remove 'patch-chkdupexe' phase.  Add 'pre-check' phase.
  [native-inputs]: Add NET-BASE.
* gnu/packages/patches/util-linux-perl.patch: Remove.
* gnu/packages/patches/util-linux-tests.patch: New file.
* gnu-system.am (dist_patch_DATA): Adjust accordingly.

gnu: e2fsprogs: Update to 1.42.11.

* gnu/packages/linux.scm (e2fsprogs): Update to 1.42.11.

doc: Add services to the configuration template.

* gnu/system/os-config.tmpl (services): New field.

install: Make sure 'info' can decompress the Info files.

* gnu/system/install.scm (log-to-info): Add GZIP to $PATH.

doc: Update USB installation image name.

* doc/guix.texi (System Installation): Change image name to guix-usb-*.

doc: Introduce the Guix System Distribution.

* doc/guix.texi (Introduction): Introduce "Guix System Distribution".
  Add a couple of sentences about it.  Remove "Guixotic".
  (GNU Distribution): Likewise.
  (System Installation): Ditto.

gnu: nvi: Fix Berkely DB compatability issues.

* gnu/packages/patches/nvi-db4.patch: New file.
* gnu/packages/patches/nvi-dbpagesize-binpower.patch: New file.
* gnu/packages/nvi.scm (nvi): Make use of them.
* gnu-system.am (dist_patch_DATA): Add them.

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

gnu: sudo: Set rundir, vardir and iologdir.

* gnu/packages/admin.scm (sudo)[arguments]<#:configure-flags>: Add
  --with-rundir=/run/sudo --with-vardir=/var/db/sudo
  --with-iologdir=/var/log/sudo-io.

system: Make D-Bus warnings non fatal.

* gnu/system.scm (etc-directory): Add 'DBUS_FATAL_WARNINGS' in PROFILE.

system: Create /etc/emacs/site-start.el.

* gnu/system.scm (emacs-site-file, emacs-site-directory): New
  procedures.
  (etc-directory): Add 'EMACSLOADPATH' setting to PROFILE.  Call
  'emacs-site-directory', and bind its result to /etc/emacs.

gnu: guix-devel: Propagate Geiser.

* gnu/packages/package-management.scm (guix-devel)[propagated-inputs]:
  Add GEISER.

doc: Update 'ROADMAP'.

Suggested by Omar Radwan <toxemicsquire4@gmail.com>.

* ROADMAP: Rewrite.

guix system: Improve error messages.

* guix/ui.scm (report-error): Export.
* guix/scripts/system.scm (read-operating-system): Report syntax errors
  using standard GNU format.  Report other errors using 'display-error'.

gnu: Add convenience macros to make module imports more concise.

* gnu.scm (use-package-modules, use-service-modules,
  use-system-modules): New macros.

store: Change 'run-with-store' to return a single value.

* guix/store.scm (run-with-store): Wrap 'run-with-state' in
  'call-with-values'.  Return only the first value.