Code review comment for lp:~ipython-dev/ipython/kernel-config

This is the result of a massive effort to refactor IPython.kernel to use the new config system. This also includes an improved ipcluster/ipcontroller/ipengine command line programs. Here are the main files that should be reviewed:

IPython.kernel:

* clusterdir.py
* ipcontrollerapp.py
* ipengineapp.py
* launcher.py
* ipclusterapp.py

IPython.config.default:

* ipcontroller_config.py
* ipengine_config.py
* ipcluster_config.py

I have also fixed a number of bugs and problems in IPython itself:

* The command line options use a new style.
* %debug is fixed.
* New magics %load_ext/%unload_ext/%reload_ext/%install_profiles/%install_default_config.

Enjoy!