gnu: gnupg: Update to 2.0.25 and 1.4.18.

* gnu/packages/gnupg.scm (gnupg): Update to 2.0.25.
  (gnupg-1): Update to 1.4.18.

build: Support running the test suite from a directory with symlinks.

Fixes <http://bugs.gnu.org/17935>.
Reported by Alex Kost <alezost@gmail.com>.

* test-env.in: Canonicalize $NIX_STORE_DIR, and remove
  $NIX_IGNORE_SYMLINK_STORE setting.
* tests/guix-register.sh: Likewise, canonicalize $new_store_dir and
  $new_store and leave $NIX_IGNORE_SYMLINK_STORE unchanged.

gnu: Add maxima.

* gnu/packages/maths.scm (maxima): New variable.

gnu: Add gcl.

* gnu-system.am (GNU_SYSTEM_MODULES): Add new package.
* gnu/packages/lisp.scm: New file.

guix package: Try $LOGNAME in addition to $USER.

Fixes <http://bugs.gnu.org/17946>.

Notoriously, cron jobs may set LOGNAME only and not USER.  See
e.g. crontab(5) under Debian 7 (wheezy).

* guix/scripts/package.scm (%profile-directory)
(guix-package): Also try LOGNAME if USER is unset.

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

Thank Taylan and Alex.

guix package: Do the right thing for '-p ~/.guix-profile'.

Fixes <http://bugs.gnu.org/17939>.
Reported by Taylan Ulrich Bayirli/Kammer <taylanbayirli@gmail.com>.

* guix/scripts/package.scm (canonicalize-profile): New procedure.
  (%options): Use it for --profile.
* tests/guix-package.sh: Add test.

vm: Enable QEMU support in the freestanding VM image.

* gnu/system/vm.scm (system-qemu-image): Add 'initrd' field.

gnu: Avoid circular dependency among modules.

Reported by Alex Kost <alezost@gmail.com>.

* gnu/packages/python.scm: Don't use #:select for (gnu packages zip).

gnu: Add gegl and gimp

* gnu/packages/gimp.scm (gegl, gimp): New variables.

doc: Document user accounts and user groups.

* doc/guix.texi (File Systems): Fix typo.
  (User Accounts): Populate.

linux-initrd: Use 'call-with-error-handling' when booting.

* guix/build/linux-initrd.scm (canonicalize-device-spec): When label
  resolution fails, call 'error' instead of 'format' + 'start-repl'.
  (boot-system): Wrap most of body in 'call-with-error-handling'.
  Remove 'catch' around 'primitive-load' call.

linux-initrd: Remove unused local procedure.

* guix/build/linux-initrd.scm (boot-system)[resolve]: Remove.

gnu: Add youtube-dl.

* gnu/packages/video.scm (youtube-dl): New variable.

doc: Write about file system configuration.

* doc/guix.texi (Using the Configuration System): Change 'guix system
  boot' to 'guix system reconfigure'.
  (File Systems, User Accounts, Services): New nodes.

linux-initrd: Gracefully handle lack of or invalid ext2 superblocks.

Reported by David Thompson <dthompson2@worcester.edu>.

* guix/build/linux-initrd.scm (read-ext2-superblock): Add
  'superblock-size' variable.  Read with 'get-bytevector-n!' instead of
  'getbytevector-n', and make sure we read exactly SUPERBLOCK-SIZE
  bytes.

gnu: pdf: Add PoDoFo.

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

gnu: Add cmatrix.

* gnu/packages/games.scm (cmatrix):  New variable.

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

gnu: Add node.

* gnu-system.am (GNU_SYSTEM_MODULES): Add new package.
* gnu/packages/node.scm: New file.

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

services: Add lshd service.

* gnu/services/ssh.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add it.