- Adds a new "parent" property on main results. This shows an abbreviated version of the project's parent, or null if the project is a root project.
- Adds a new "ancestor" attachment to pull the entire ancestor list.
- Adds a new "depth" property on main results.
- You can use "parent" or "depth" to tell if a project is a subproject or not.
These attempt to balance convenience, power, and performance: the full ancestor list can be big so I made it an attachment, but the other stuff isn't too big and is cheap and seems reasonable to always include.