Add AdjacencyMatrix graph representation

alib2data/src/graph/directed/AdjacencyListDirectedGraph.cpp

...2data/src/graph/directed/AdjacencyMatrixDirectedGraph.cpp

alib2data/src/graph/directed/AdjacencyMatrixDirectedGraph.h

alib2data/src/graph/directed/DirectedGraph.cpp

...ata/src/graph/undirected/AdjacencyListUndirectedGraph.cpp

...a/src/graph/undirected/AdjacencyMatrixUndirectedGraph.cpp

...ata/src/graph/undirected/AdjacencyMatrixUndirectedGraph.h

alib2data/src/graph/undirected/UndirectedGraph.cpp

alib2data/src/graph/undirected/utils.h

alib2data/src/std/compare.hpp