Calculator for a adjacency matrix representation of this AtomContainer. An
adjacency matrix is a matrix of quare NxN matrix, where N is the number of
atoms in the AtomContainer. The element i,j of the matrix is 1, if the i-th
and the j-th atom in the atomcontainer share a bond. Otherwise it is zero.
See (Trinijastic, N., Chemical Graph Theory, 1992, CRC Press).