implement Operation\Quantifier in Linq (with tests)
behavior for missing keyExtractor in GroupingIterator
add searchRange in OrderedDictionary, IndexIterator
change names of the left and right iterators in JoinIterator
implement Operation\Joining in Linq (with tests)
implement Operation\Aggregation in Linq (with tests)
implement Operation\Element in Linq (with tests)
implement Operation\Concatenation in Linq (with tests)
implement Operation\Equality in Linq (with tests)
implement Operation\Grouping in Linq
remove deprecated implementations of Linq methods
remove deprecated files