Remaining Effort curve on Burndown chart - v1

Remaining effort is plotted from the iteration StartDate to
DateTime.Now. It counts how many untested test cases each test run from
each test plan has.

Moved to BaseController GetDistinctResults method and removed it from
ExecuteTestRunController, IterationsController and ResultsController.

Editing an Iteration now returns to TestPlanPerIteration/<iterationID>.