This is in preparation of making a stable release/branch. The version
number is <YY>.<MM>, Ubuntu style, denoting the intended release
year/month. It also has a release codename ("Aardvark").
currently activated NixOS. This is "0.1pre-svn" when built from a
SVN tree, but contains the actual revision when installed from the
NixOS channel or from the ISO.
svn path=/nixos/trunk/; revision=33730