BeforeExtraIteration and AfterExtraIteration signals.
Refactored ThreadingDiagnoser and ExceptionDiagnoser to implement IInProcessDiagnoser using the new signals.
* Fixed tests.
* Reduce number of tests in default toolchain.
* Added AggressiveOptimizationOption to all methods called from Engine.RunExtraIteration.
* Remove unused DiagnoserResults.TotalOperations.
* Clarify iteration setup/cleanup timing in xml docs.
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#380