Deletes IntervalTestHelper as we couldn't control the random generator good enough to redo tests. All methods have been moved to IntervalCollectionTester
Refactors random so previous failing tests can be reinvoked each time.
Updates Span invariant for DIT
Fixes failing tests
Merge branch 'master' of https://github.com/lundmikkel/C5
Alters the types of the internal data structures for interval lists in DIT
Adds another test case with a fixed seed
Uncomments a contract on Choose
Adds comment about the name of MaximumOverlap
Merge branch 'master' of https://github.com/lundmikkel/C5