When two targets have the same end date with overlapping scopes, choose the target with the later start date #45
Description
When two targets have the same end date with overlapping scopes, choose the target with the later start date. If the two targets have the same start date, throw error. If there is no start date, treat as pre-historic. If both are pre-historic, it's a clash.
Need test cases for the various examples and documentation.