[Userops] Guix gains container support

[Christopher Allan Webber]

Hello all!  A major milestone in deployment for Guix has been reached
recently; David Thompson has managed to land container support in Guix!

  https://savannah.gnu.org/forum/forum.php?forum_id=8386

This can be useful in several ways:
 - Proper process isolation is supported.  Want to run your browser
   in a more secure manner?  Sandbox it in the container!
 - You can test a system profile in a less expensive manner by launching
   in a container rather than booting up a full VM
 - You can launch a safely isolated development environment for a
   package, similar to the "Guix as a universal virtualenv with guix
   environment", but safer.
 - All this while taking advantage of Guix's existing properties as a
   fully scriptable, fully declarative and reproducible package
   management system!  Pretty neat, I think.

Since Docker will no doubt come up, those curious for a Docker
comparison should look towards the end of this mailing list post for a
breakdown.

  http://lists.gnu.org/archive/html/guix-devel/2015-10/msg00916.html

Hope that's interesting to some of you!

 - Chris