Massive package and module reorganization of all of IPython. * New top-level sub-packages have been created: :mod:`IPython.core`, :mod:`IPython.lib`, :mod:`IPython.utils`, :mod:`IPython.deathrow`, :mod:`IPython.quarantine`. All existing top-level modules have been moved to appropriate sub-packages. All internal import statements have been updated and tests have been added. The build system (setup.py and friends) have been updated. * Compatability modules have been created for :mod:`IPython.Shell`, :mod:`IPython.ipapi` and :mod:`IPython.iplib` that display warnings and then load the actual implementation from :mod:`IPython.core`. * :mod:`Extensions` has been moved to :mod:`extensions`.