More intuitive sorting order of domains

[favonia]

The problem is how to implement this "intuitive" order (very) efficiently.

• a.example.com
• b.example.com
• c.example.com
• example.org
• a.example.org
• a.a.example.org
• b.example.org
• c.example.org

[favonia]

Solution: come up with an "expensive" sorting algorithm (new) and use it carefully in the codebase.