pkgs/top-level/all-packages.nix: renamed 'python31Base' attribute to 'python3'
pkgs/top-level/all-packages.nix: renamed 'python31Base' attribute to 'python3'

The distinction between pythonBase and pythonFull is useful for bootstrapping
purposes, because it allows a version of Python to be built that has very few
dependencies. Python 3.x, however, isn't used in the low-level system, so a
"base variant" of that package is not required. Even if it were, the best
approach to implement that feature would be using 'override'.

svn path=/nixpkgs/trunk/; revision=25748

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