tarball fixes
buildPythonPackage: introduce "disabled" argument

Useful to disable the package for specific python versions.

Typically usage: disable = isPy3k;
pythonPackages.pg8000: 1.09 -> 1.9.14
pythonPackages.iptools: 0.4.0 -> 0.6.1
Remove obsolete directory
Merge pull request #3759 from lynxlynxlynx/master

meta.xml: fixed small omission
pythonPackages.pil: put it inside python-packages.nix and disable on py3k
pythonPackages.manuel: 1.6.1 -> 1.8.0
python3Packages.afew: fix build
python3Packages.autopep8: fix build
pythonPackages.beaker: disable on py3k
pythonPackages.eventlet: 0.9.16 -> 0.15.1
pythonPackages.greenlet: 0.3.1 -> 0.4.3
gemrb: added more meta tags + general maintenance
gemrb: bumped to 0.8.1