Implement the back and front end support for the project owner and/or user model.
Updated the milestone to M4.
Some of the requirements for user types / permissions documented in https://bugzilla.yoctoproject.org/show_bug.cgi?id=9418#c10
The first implementation should leverage the Django user interface, which has gotten fairly adequate. The issue is that none of the content is tagged with user IDs. This will require a major schema update.