Discovering the p2 API's

Some warnings about how to get into trouble with p2 and the correct way to use it. Primarily this means letting p2 handle all things related to an installation and not modifying the application by hand... ever. Described was how to tweak the Update Dialog GUI, e.g. removing the repositories selector and add button, and how the headless API has been greatly simplified. Good overview information if we needed to interact with the p2 API but no practical information on setting up or maintaining a p2 repository as I had hoped.