gnu: Add cssc.

* gnu/packages/version-control.scm (cssc): New variable.
* gnu/packages/patches/cssc-gets-undeclared.patch: New file
* gnu/packages/patches/cssc-missing-include.patch: New file
* gnu-system.am: Add gnu/packages/patches/cssc-gets-undeclared.patch
  and gnu/packages/patches/cssc-missing-include.patch

gnu: hdf5: Fix source download location.

* gnu/packages/maths.scm (hdf5): Use "release" directory and not the "current"
    directory for the source, which does not break on new upstream releases.

gnu: Add Autoconf 2.64.

* gnu/packages/autotools.scm (autoconf-2.64): New variable.

gnu: librsync: Fix source uri

* gnu/packages/rsync.scm (librsync) [source]: Fix sourceforge uri.

gnu: Add duplicity.

* gnu/packages/backup.scm: New file.
* gnu-system.am: Add it.

gnu: Add python-mock.

* gnu/packages/python.scm (python-mock): New variable.

gnu: Add python-lockfile.

* gnu/packages/python.scm (python-lockfile): New variable.

services: Add D-Bus and Avahi.

* gnu/services/dbus.scm: New file.
* gnu/services/avahi.scm: New file.
* gnu-system.am (GNU_SYSTEM_MODULES): Add them.

gnu: Add Transmission.

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

gnu: Add gsegrafix and dependent libraries.

* gnu/packages/math.scm (gsegrafix): New variable.
* gnu/packages/gtk.scm (pangox-compat): New variable.
* gnu/packages/gnome.scm (libidl, orbit2, libbonobo, gconf, gnome-mime-data,
  gnome-vfs, libgnome, libart-lgpl, libgnomecanvas, libgnomeui, libglade,
  libgnomeprint, libgnomeprintui, libbonoboui): New variables.

gnu: Add mcrypt, libmcrypt, and libmhash.

* gnu/packages/mcrypt.scm: New file.
* gnu/packages/patches/mhash-keygen-test-segfault.patch: New patch.
* gnu-system.am (GNU_SYSTEM_MODULES): Add file.
  (dist_patch_DATA): Add patch.

gnu: Add librsync.

* gnu/packages/rsync.scm (librsync): New variable.

gnu: Add inotify-tools.

* gnu/packages/linux.scm (inotify-tools): New variable.

services: nscd: Provide an 'activate' script to make /var/run/nscd.

* gnu/services/base.scm (nscd-service): Add 'activate' field.
* guix/build/install.scm (directives): Remove /var/run/nscd; add
  /var/run.
* doc/guix.texi (Defining Services): Add 'activate' field in example.
  Document it.

services: Support per-service activation scripts.

* gnu/services.scm (<service>)[activate]: New field.
* gnu/system.scm (operating-system-activation-script)[service-activations]:
  New procedure.  Use it, and primitive-load each activation.

system: Separate the activation script from the boot script.

* gnu/system.scm (operating-system-activation-script): New procedure,
  containing most of the former 'operating-system-boot-script'.
  (operating-system-boot-script): Call it, and 'primitive-load' its
  result.
* guix/build/activation.scm (%booted-system): Remove.
  (activate-current-system): Remove #:boot? parameter and related code.

gnu: Add lzop.

* gnu/packages/compression.scm (lzop): New variable.

vm: Disable QEMU networking in the disk image initrd.

* gnu/system/linux-initrd.scm (qemu-initrd): Add #:qemu-networking?
  parameter and honor it.
* gnu/system/vm.scm (system-disk-image): Pass #:qemu-networking #f.

vm: Add 'system-disk-image'.

* gnu/system/vm.scm (system-disk-image): New procedure.

vm: Use a para-virtualized disk when creating an image.

* guix/build/vm.scm (load-in-linux-vm): When MAKE-DISK-IMAGE?, use
  '-drive ...,if=virtio' for better performance.
* gnu/system/vm.scm (qemu-image): Use /dev/vda instead of /dev/sda.