Making MTreeBase<>::ResultsIterator work more like standard STL iterators.
Making MTreeBase<>::ResultsIterator work more like standard STL iterators.

tranvanluan2/M-Tree,tranvanluan2/M-Tree,erdavila/M-Tree,erdavila/M-Tree,tranvanluan2/M-Tree,erdavila/M-Tree,tranvanluan2/M-Tree,tranvanluan2/M-Tree,erdavila/M-Tree,erdavila/M-Tree,erdavila/M-Tree