Python version 3.x is really quite different from 2.x. Using a new name
for the package prevents Nix from performing unintended updates to the
3.x version.
svn path=/nixpkgs/trunk/; revision=21264
- cleanup python libraries:
* moving all python libraries into a attr set into a directory
so that expressions can be used for both: python 2.5 and 2.6 easily
* disabling packages which don't build
svn path=/nixpkgs/trunk/; revision=21142