a worthy goal to move the Python packages that are currently in
all-packages.nix into a single attribute set, but this doesn't
require moving python-packages.nix or the other changes made to that
file. The Python packages in all-packages.nix should simply be
moved to python-packages.nix, and ideally changed to use
buildPythonPackage.
svn path=/nixpkgs/trunk/; revision=21196