progress on threadsafety of containers - test re-org for iterator owning iterable
formatting
minor ordering fix
comments
new Iterable<T>::IterableSharedPtr/_IteratorSharedPtr and IterableSharedPtr to reduce ambiguity and unclearity about which _SharedPtrIRep dealing with in iterables
Added #define for qStroika_Foundation_Traveral_IteratorHoldsSharedPtr_  partial experimental impl
merged changes for qStroika_Foundation_Traveral_IteratorHoldsSharedPtr_