Multi-Stage Checkout

[Madoc]

When adding new projects, there may be projects that contain the Dirish files used for including other projects.
Currently, this is the case, as jackadull-related also contains the Dirish files.
Ensure that this can be initialized properly.

Here is an idea:
Maybe add a special syntax for including all GitHub repos that match a certain filter, e.g. everything from one particular organization or user.