This class represents connected clusters between layers where weights are the number of shared nodes.
Connections are stored with one 'source' cluster which is connected to n 'destination' clusters, with n >= 0.
:param cluster_label: The cluster label of the 'source' cluster
:param cluster_layer: The layer name of the 'source' cluster
:param cluster_runId: The run which calculated the connections
:param cluster_containedNodesDict: Ids of nodes contained in the 'source' cluster
:param cluster_connNodesDict: Ids of nodes contained in 'dest' clusters, where the 'dest' cluster is uniquely identifiable by layer name and cluster label
:param cluster_connClustDict: Layer name, cluster label and weight for each 'dest' cluster